I stumbled upon an issue where Format and Region gets deleted. It happens when you are in Edit mode and quickly go to Next en Previous entries. I think I only managed to reproduce this when using the Shortcuts Ctrl+j and Ctrl+k very quickly. Not really a common way to go through the screens, but I did this when searching for something. Then I noticed my Format field was getting deleted. I recorded an example:
The 2 other windows you see popup are the windows Firefox produces when using Ctrl+j and Ctrl+k, because it are the same shortkeys as Firefox uses.