Modloader: Forge 47.3.0
Mod Version: 1.20.1-9.1.33

1. Describe the bug

When the pickup upgrade tries to put an item into a backpack that has no space for the picked up item, the item gets deleted

2. Write steps to reproduce the bug

• Put Pickup upgrade on backpack
• Fill backpack up with items
• Pick up item

3. What is expected behaviour

If a pickup upgrade has no place to put an item in a backpack's inventory and can't void it, then the item should either go to the player's inventory, or not be picked up.

Could you show me your setup for pickup and items inside backpack?
I've tried to reproduce but it works properly for me. Backpack is full and all items that are picked up go to player inventory or stay on the ground if player's inventory is full too.