While changing game mode some items are moved out of your inventory to the 2x2 crafting grid.
To reproduce:
Change your game mode to creative
Put a full stack of 64 items in your first hotbar slot (I tested diamonds)
Change your game mode to survival
This bug is new in this snapshot, it won't happen in 1.12
Linked issues
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Comments 3
Duplicate of MC-119840. Going to edit that one to expand on it there.
I searched for open tickets, and didn't see MC-119840 since it was postponed at that time. 😞
Can confirm... only with diamonds (so far); most other items do not do this. And it can happen on seemingly any chat message?