If I open the creative inventory and attempt to pull out an item, the stack I'm holding disappears immediately. It shows up for maybe a tick or two, then is gone, so I can't actually take anything from the creative inventory. This happens whether I click-and-hold or just single click.
Linked issues
duplicates 1
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Not that I know of. I was just able to actually reproduce it in my own inventory after trading with a villager for a bit; all the items in my inventory became ghost items that just disappeared when I tried to take them out. During trading, shift+clicking the results out of the inventory also lead to my input stack (emeralds) only losing a few items, but then reverting to the correct (lower) amount after clicking it. When this happened, the shift+clicked results wouldn't show in my inventory until I clicked something, either, and then they suddenly appeared.
I'll try creating a fresh world to see if maybe I do have some commands running I've forgotten about.
EDIT Well, in a fresh world, the problem disappears. Maybe I do have a command somewhere that I've long since forgotten about... well, there goes my testing world 😞 Anyway, I guess this can be marked invalid, then.
Cannot reproduce. Are you using any /clear commands in command blocks?