iMac MacOS 10.15.3 / CC PS 21.11 / ACR 184.108.40.2066 (I just updated latest fixes a few minutes ago)
This appears to be a function of refreshing screen when GPU is active since the behavior is not replicated when turned off. When 2 images are open in ACR (for comparitive purposes) the images are not always refreshed when flipping back and forth between them. Performing a screen function like moving the image slightly forces a refresh.
"Screen Shot 2020-03-24 at 11.31.43 AM" should not have the feather in it even though it is labelled correctly as active since the image from DSC_0143 is actually the one still being shown.baseline @200%Base line @200%Screen not refreshed / should not have featherfull imagefull image