The crafter's output slot is meant to be just for display, not interacted with. The player cannot manually take an item out of it, only craft the item with a redstone signal. However, the game doesn't behave as expected when manually putting an item into the slot.

Steps to Reproduce:

1. Enable the Update 1.21 Experiment;
2. Place a crafter down;
3. Try putting any item on its output slot.

Observed Results:
The item is dropped.

Expected Results:
Nothing happens when interacting with the output slot and the item remains selected.

Screenshots/Videos attached: Yes

Notes: