bug when inserting materials into backpack

[Vincent983]

Description

I tried to put a material item in my backpack, it went in and stacked with a preexisting material in it, but then a do-after occurs, and if not interrupted, it makes a fake transparent duplicate of the item that you have no way of removing, fucking up your backpack storage forever.

Test Merges

Don't know

Reproduction Steps

1. Have stack of material in backpack
2. Insert new stack of material that is the same as old one
3. it stacks with the old stack
4. it starts do-after that makes invisible item in backpack if not interrupted
5. cry as now your radiopack is broken forever

Screenshots

No response