diff --git a/python/core/auto_generated/processing/qgsprocessingutils.sip.in b/python/core/auto_generated/processing/qgsprocessingutils.sip.in
index c72ac8b1eeb..e4b9853d823 100644
--- a/python/core/auto_generated/processing/qgsprocessingutils.sip.in
+++ b/python/core/auto_generated/processing/qgsprocessingutils.sip.in
@@ -177,11 +177,11 @@ temporary layer store.
 %End
 
 
-    static QgsRectangle combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &transformContext );
+    static QgsRectangle combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context );
 %Docstring
 Combines the extent of several map ``layers``. If specified, the target ``crs``
 will be used to transform the layer's extent to the desired output reference system
-using the specified ``transformContext``.
+using the specified ``context``.
 
 .. versionadded:: 3.10
 %End
diff --git a/python/plugins/processing/algs/grass7/Grass7Algorithm.py b/python/plugins/processing/algs/grass7/Grass7Algorithm.py
index 8b1660b2546..c3793952950 100644
--- a/python/plugins/processing/algs/grass7/Grass7Algorithm.py
+++ b/python/plugins/processing/algs/grass7/Grass7Algorithm.py
@@ -489,9 +489,9 @@ class Grass7Algorithm(QgsProcessingAlgorithm):
                     elif layer.type() == QgsMapLayerType.VectorLayer:
                         self.loadVectorLayer(layerName, layer, external=None, feedback=feedback)
 
-        self.postInputs()
+        self.postInputs(context)
 
-    def postInputs(self):
+    def postInputs(self, context):
         """
         After layer imports, we need to update some internal parameters
         """
@@ -500,7 +500,7 @@ class Grass7Algorithm(QgsProcessingAlgorithm):
 
         # Build GRASS region
         if self.region.isEmpty():
-            self.region = QgsProcessingUtils.combineLayerExtents(self.inputLayers)
+            self.region = QgsProcessingUtils.combineLayerExtents(self.inputLayers, context)
         command = 'g.region n={} s={} e={} w={}'.format(
             self.region.yMaximum(), self.region.yMinimum(),
             self.region.xMaximum(), self.region.xMinimum()
diff --git a/python/plugins/processing/algs/grass7/ext/r_blend_combine.py b/python/plugins/processing/algs/grass7/ext/r_blend_combine.py
index 3755ccf68a5..4b154b156ca 100644
--- a/python/plugins/processing/algs/grass7/ext/r_blend_combine.py
+++ b/python/plugins/processing/algs/grass7/ext/r_blend_combine.py
@@ -33,7 +33,7 @@ def processInputs(alg, parameters, context, feedback):
     # Use v.in.ogr
     for name in ['first', 'second']:
         alg.loadRasterLayerFromParameter(name, parameters, context, False, None)
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processOutputs(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/r_blend_rgb.py b/python/plugins/processing/algs/grass7/ext/r_blend_rgb.py
index 770965c2bf7..644e10361ca 100644
--- a/python/plugins/processing/algs/grass7/ext/r_blend_rgb.py
+++ b/python/plugins/processing/algs/grass7/ext/r_blend_rgb.py
@@ -37,7 +37,7 @@ def processInputs(alg, parameters, context, feedback):
     # Use v.in.ogr
     for name in ['first', 'second']:
         alg.loadRasterLayerFromParameter(name, parameters, context, False, None)
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processCommand(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/r_category.py b/python/plugins/processing/algs/grass7/ext/r_category.py
index 14372cc71e5..bad9a28fe8d 100644
--- a/python/plugins/processing/algs/grass7/ext/r_category.py
+++ b/python/plugins/processing/algs/grass7/ext/r_category.py
@@ -52,7 +52,7 @@ def processInputs(alg, parameters, context, feedback):
                                          parameters, context,
                                          False, None)
     alg.loadRasterLayerFromParameter('map', parameters, context)
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processCommand(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/r_colors.py b/python/plugins/processing/algs/grass7/ext/r_colors.py
index 008f1865417..b5aadd8d3bd 100644
--- a/python/plugins/processing/algs/grass7/ext/r_colors.py
+++ b/python/plugins/processing/algs/grass7/ext/r_colors.py
@@ -54,7 +54,7 @@ def processInputs(alg, parameters, context, feedback):
     if raster:
         alg.loadRasterLayerFromParameter('raster', parameters, context, False, None)
 
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processCommand(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/r_colors_stddev.py b/python/plugins/processing/algs/grass7/ext/r_colors_stddev.py
index e5bcc5bab7d..66c1c76bb89 100644
--- a/python/plugins/processing/algs/grass7/ext/r_colors_stddev.py
+++ b/python/plugins/processing/algs/grass7/ext/r_colors_stddev.py
@@ -35,7 +35,7 @@ def processInputs(alg, parameters, context, feedback):
 
     # We need to import all the bands and color tables of the input raster
     alg.loadRasterLayerFromParameter('map', parameters, context, False, None)
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processCommand(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/r_null.py b/python/plugins/processing/algs/grass7/ext/r_null.py
index 162b23bb46e..989cfab9b44 100644
--- a/python/plugins/processing/algs/grass7/ext/r_null.py
+++ b/python/plugins/processing/algs/grass7/ext/r_null.py
@@ -42,7 +42,7 @@ def processInputs(alg, parameters, context, feedback):
 
     # We need to import without r.external
     alg.loadRasterLayerFromParameter('map', parameters, context, False)
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processCommand(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/r_rgb.py b/python/plugins/processing/algs/grass7/ext/r_rgb.py
index 2ae41e860b8..cddd4c5594b 100644
--- a/python/plugins/processing/algs/grass7/ext/r_rgb.py
+++ b/python/plugins/processing/algs/grass7/ext/r_rgb.py
@@ -32,7 +32,7 @@ def processInputs(alg, parameters, context, feedback):
 
     # We need to import all the bands and color tables of the input raster
     alg.loadRasterLayerFromParameter('input', parameters, context, False, None)
-    alg.postInputs()
+    alg.postInputs(context)
 
 
 def processCommand(alg, parameters, context, feedback):
diff --git a/python/plugins/processing/algs/grass7/ext/v_sample.py b/python/plugins/processing/algs/grass7/ext/v_sample.py
index 62db74edbcb..330180beecc 100644
--- a/python/plugins/processing/algs/grass7/ext/v_sample.py
+++ b/python/plugins/processing/algs/grass7/ext/v_sample.py
@@ -34,4 +34,4 @@ def processInputs(alg, parameters, context, feedback):
     # and we can use r.external for the raster
     alg.loadVectorLayerFromParameter('input', parameters, context, feedback, False)
     alg.loadRasterLayerFromParameter('raster', parameters, context, True)
-    alg.postInputs()
+    alg.postInputs(context)
diff --git a/python/plugins/processing/algs/grass7/ext/v_to_3d.py b/python/plugins/processing/algs/grass7/ext/v_to_3d.py
index 88265aa5290..72bb7bc89fa 100644
--- a/python/plugins/processing/algs/grass7/ext/v_to_3d.py
+++ b/python/plugins/processing/algs/grass7/ext/v_to_3d.py
@@ -42,4 +42,4 @@ def processInputs(alg, parameters, context, feedback):
 
     # We need to import the vector layer with v.in.ogr
     alg.loadVectorLayerFromParameter('input', parameters, context, feedback, False)
-    alg.postInputs()
+    alg.postInputs(context)
diff --git a/python/plugins/processing/algs/qgis/RasterCalculator.py b/python/plugins/processing/algs/qgis/RasterCalculator.py
index 9210edc0fe2..03ab80e03cd 100644
--- a/python/plugins/processing/algs/qgis/RasterCalculator.py
+++ b/python/plugins/processing/algs/qgis/RasterCalculator.py
@@ -127,7 +127,7 @@ class RasterCalculator(QgisAlgorithm):
                 bbox = transform.transformBoundingBox(bbox)
 
         if bbox.isNull() and layers:
-            bbox = QgsProcessingUtils.combineLayerExtents(layers, crs)
+            bbox = QgsProcessingUtils.combineLayerExtents(layers, crs, context)
 
         cellsize = self.parameterAsDouble(parameters, self.CELLSIZE, context)
         if cellsize == 0 and not layers:
diff --git a/src/core/processing/qgsprocessingutils.cpp b/src/core/processing/qgsprocessingutils.cpp
index 6feea171aaa..441578260ef 100644
--- a/src/core/processing/qgsprocessingutils.cpp
+++ b/src/core/processing/qgsprocessingutils.cpp
@@ -627,7 +627,7 @@ void QgsProcessingUtils::createFeatureSinkPython( QgsFeatureSink **sink, QString
 }
 
 
-QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &transformContext )
+QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context )
 {
   QgsRectangle extent;
   for ( const QgsMapLayer *layer : layers )
@@ -638,7 +638,7 @@ QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *>
     if ( crs.isValid() )
     {
       //transform layer extent to target CRS
-      QgsCoordinateTransform ct( layer->crs(), crs, transformContext );
+      QgsCoordinateTransform ct( layer->crs(), crs, context.transformContext() );
       try
       {
         QgsRectangle reprojExtent = ct.transformBoundingBox( layer->extent() );
@@ -662,7 +662,8 @@ QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *>
 // Deprecated
 QgsRectangle QgsProcessingUtils::combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs )
 {
-  return QgsProcessingUtils::combineLayerExtents( layers, crs, QgsCoordinateTransformContext( ) );
+  QgsProcessingContext context;
+  return QgsProcessingUtils::combineLayerExtents( layers, crs, context );
 }
 
 QVariant QgsProcessingUtils::generateIteratingDestination( const QVariant &input, const QVariant &id, QgsProcessingContext &context )
diff --git a/src/core/processing/qgsprocessingutils.h b/src/core/processing/qgsprocessingutils.h
index 63dbb759466..784350b1684 100644
--- a/src/core/processing/qgsprocessingutils.h
+++ b/src/core/processing/qgsprocessingutils.h
@@ -217,10 +217,10 @@ class CORE_EXPORT QgsProcessingUtils
     /**
      * Combines the extent of several map \a layers. If specified, the target \a crs
      * will be used to transform the layer's extent to the desired output reference system
-     * using the specified \a transformContext.
+     * using the specified \a context.
      * \since QGIS 3.10
      */
-    static QgsRectangle combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &transformContext );
+    static QgsRectangle combineLayerExtents( const QList<QgsMapLayer *> &layers, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context );
 
     /**
      * Combines the extent of several map \a layers. If specified, the target \a crs
diff --git a/tests/src/analysis/testqgsprocessing.cpp b/tests/src/analysis/testqgsprocessing.cpp
index 721addac3cf..39551482ef6 100644
--- a/tests/src/analysis/testqgsprocessing.cpp
+++ b/tests/src/analysis/testqgsprocessing.cpp
@@ -6236,7 +6236,8 @@ void TestQgsProcessing::checkParamValues()
 
 void TestQgsProcessing::combineLayerExtent()
 {
-  QgsRectangle ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() );
+  QgsProcessingContext context;
+  QgsRectangle ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>(), context );
   QVERIFY( ext.isNull() );
 
   QString testDataDir = QStringLiteral( TEST_DATA_DIR ) + '/'; //defined in CmakeLists.txt
@@ -6248,20 +6249,20 @@ void TestQgsProcessing::combineLayerExtent()
   QFileInfo fi2( raster2 );
   std::unique_ptr< QgsRasterLayer > r2( new QgsRasterLayer( fi2.filePath(), "R2" ) );
 
-  ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() << r1.get() );
+  ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() << r1.get(), context );
   QGSCOMPARENEAR( ext.xMinimum(), 1535375.000000, 10 );
   QGSCOMPARENEAR( ext.xMaximum(), 1535475, 10 );
   QGSCOMPARENEAR( ext.yMinimum(), 5083255, 10 );
   QGSCOMPARENEAR( ext.yMaximum(), 5083355, 10 );
 
-  ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() << r1.get() << r2.get() );
+  ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() << r1.get() << r2.get(), context );
   QGSCOMPARENEAR( ext.xMinimum(), 781662, 10 );
   QGSCOMPARENEAR( ext.xMaximum(), 1535475, 10 );
   QGSCOMPARENEAR( ext.yMinimum(), 3339523, 10 );
   QGSCOMPARENEAR( ext.yMaximum(), 5083355, 10 );
 
   // with reprojection
-  ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() << r1.get() << r2.get(), QgsCoordinateReferenceSystem::fromEpsgId( 3785 ) );
+  ext = QgsProcessingUtils::combineLayerExtents( QList< QgsMapLayer *>() << r1.get() << r2.get(), QgsCoordinateReferenceSystem::fromEpsgId( 3785 ), context );
   QGSCOMPARENEAR( ext.xMinimum(), 1995320, 10 );
   QGSCOMPARENEAR( ext.xMaximum(), 2008833, 10 );
   QGSCOMPARENEAR( ext.yMinimum(), 3523084, 10 );