When looking in your inventory, inside a chest, dispenser, furnace, etc (in any gamemode) and try and take a screenshot by pressing F2, nothing will happen.
Linked issues
Comments 2
Duplicate of MC-29469 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
This also happens when the chat is open.