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This is particularly a problem in a state reset scenario where the membership might change without a corresponding event. This PR is targeting a scenario where a state reset happens which causes room membership to change. Previously, the cache would just hold onto stale data and now we properly bust the cache in this scenario. We have a few tests for these scenarios which you can see are now fixed because we can remove the `FIXME` where we were previously manually busting the cache in the test itself. This is a general Synapse thing so by it's nature it helps out Sliding Sync. Fix https://github.com/element-hq/synapse/issues/17368 Prerequisite for https://github.com/element-hq/synapse/issues/17929 --- Match when are busting `_curr_state_delta_stream_cache`