Forge 1.20.1-47.3.0
EMI 1.1.19
In case related somehow: JEI 15.20.0.106

Has not been tested on a minimal instance.

Issue Description

While in creative mode, when deleting an item by left clicking on the sidebar, the slot that the item was in will create a "ghost item," i.e. the game thinks there is an item in that slot, when there shouldn't be. If the item was previously in the hotbar, I can even drop the item if nothing is in that slot.

Recreation

1. Install the mods above.
2. Load a new world.
3. Put any item stack in the first available hotbar slot.
4. While in creative mode and with cheat mode enabled, delete the item stack by grabbing it with left click and deleting it by left clicking the sidebar.
5. Grab an item stack from the sidebar via CTRL + Left Click or CTRL + Right Click. The grabbed stack should be placed after the hotbar slot which the previous item was in.
6. Exit the inventory.
7. Attempt to drop an item in the slot which the previous item was in. The slot should appear empty, yet an item should still drop.