Every so often while flying in creative, not confirmed in survival, there will be an issue where the chunks stop loading and the sides of blocks become invisible and allowing X-ray to lower layers. Upon trying to access the menu or inventory, it will make a loading symbol indefinitely until it either crashes or you exit, completely close out the game, and restart. I'm not sure if this is an issue with other versions of bedrock either. I've played on my PS4 and things seem fine, but my iPad is a different story. You can even tell my map doesn’t update where I am either once the bug pops up. It’s random after flying and loading chunks, new or old, it’s happened with both.