Newish quick crop feature in photos not working as advertised

Recently discovered this feature. When I zoom in on a photo, the little crop button appears in the top right corner. As soon as I release my fingers (to tap crop), the button disappears. So it appears, then it disappears before I can execute. What in the heck is going on. I certainly cannot pinch zoom in with one hand, and tap the button with the other hand (before it disappears), I only have two hands. According to the basic usage of this, it doesn't even work. Is there some secret, undisclosed magic trick to using crop?

Thank you