It's actually a dead spot just on the screen in general... I noticed on the main menu, if you drag you cursor along the extreme right side of the Single Player button and move up/down, you will notice a delayed highlighting of buttons.
Upon entering my world, I ran into this frustrating issue, and discovered it only affects my inventory when the crafting book is open, which shifts some inventory spaces into the dead spot.
Unfortunately, it doesn't always happen. After posting this I went back to my game, but the menu delay was gone. Guess I should be glad?
Java 1.15.2
It's actually a dead spot just on the screen in general... I noticed on the main menu, if you drag you cursor along the extreme right side of the Single Player button and move up/down, you will notice a delayed highlighting of buttons.
Upon entering my world, I ran into this frustrating issue, and discovered it only affects my inventory when the crafting book is open, which shifts some inventory spaces into the dead spot.
Unfortunately, it doesn't always happen. After posting this I went back to my game, but the menu delay was gone. Guess I should be glad?
I hope this helps.