1.17.1, 1.18, 1.18.1 Pre-release 1, 1.18.1
If you pick up items when creative inventory is open, the items do not appear in survival inventory.
- In creative mode, fill your hotbar.
- Stand on the ground and face down.
- Drop items from creative inventory.
- Pick up them without closing creative inventory.
- Open survival inventory and check if the items you picked up are visible.
The items you picked up become invisible.
The items should appear in survival inventory normally.
It also can be done by opening creative inventory when you pick up items with a dropper or something.
If you interact with something such as a chest, they will be visible again.