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If visibilitymap_set() is called with flags containing a higher bit than VISIBILITYMAP_ALL_FROZEN, the state of neighboring pages is affected. While there was an assertion that *some* valid bits were set, it did not check that *only* valid bits were. Change that. Discussion: https://postgr.es/m/20230331043300.gux3s5wzrapqi4oe@awork3.anarazel.de