I have Open Camera on all my phones, but seldom use it, though it's very good.(I never took time to get to grips with it)
I think most here know it, and I tried it from a forum recommendation years ago.
Looking at it now, I had a Setting checked that 'pauses' a new photo. I quickly timed one for at least 30 seconds plus.
Edit: The shot stays indefinitely on the screen with Share, Delete and a Settings button unless you touch the photo itself. I think you may only be able to Edit via the Gallery app and not Settings.
Perhaps you had a third party camera app all along. You may have moved it to the bottom dock in lieu of the stock app.
If not, that's one solution for you.