I've tried to search in the thread, but I don't think that this has been reported before. I updated from v.20 (20.1?) to 20.3 and now there's the new Simple Gallery Pro. The problem is that the old Simple Gallery (v.5.1.3) was not removed and now I have both versions installed. I'm not quite sure of the installation path of the old Simple Gallery, so I don't know how to delete it. It's installed as a system app, so I can't just uninstall it from the app manager.
It's the same path, because the system app has been replaced with the new one. You can simply remove the old one, as it's normally a user app (update).
I was having the same problem but managed to solve the issue on my end by making a boot script in service.d and adding the following packages to the hide list:
After doing this both basic integrity and cts passes.
Oh, I see, haven't yet tested anything, so it's safe to update, yay! Edit: DroidGuard Helper alone is enough, GmsCore is always on the hide list. Will add this to the issues list.