I feel I have not changed my technique for selecting and editing features for months and just today I am finding that I am unable to select features when actively editing polygons whether it is editing vertices or just updating data in the attribute table.
I have referenced this post: Solved: ArcPro Unable to select feature with Sele... - Esri Community and all of my layer and selection settings seem to be good.
Even when I am not in editing mode, I am unable to select a feature, it will highlight in cyan and then disappear after about 0.5 seconds...
Selection Options Settings:
I've tried making this layer the only selectable layer: