Discovered while testing MC-268943.
The bug
The user interface for command blocks, structure blocks and jigsaw blocks uses the file menu_background.png, which is inconsistent with all other blocks with a user interface.
Ideally, they should use a texture file for the background instead of being hardcoded (MC-268927), however not the same one as for game menus.
How to reproduce
Download and apply the attached resource pack
Open the Game Menu
Open a chest or your inventory
Open a command block, structure block or jigsaw block UI
How to fix
Introduce a new texture file, inventory_background.png, which is used for the background texture in the user interface of command blocks, structure blocks and jigsaw blocks, as well as for any block or entity with an inventory.
Linked issues
relates to 2
Attachments
Comments 1

Confirmed