Bug Report

The Travelers backpack mod can be used to dupe item fairly easily.

Expected Behaviour

I was pulling tools out of my bag and in the process I put the tool in the slot the bag was in while the bag was open and when I went in the bag later and realized it duped it and ive done a little testing and it happens with any tool or stack/s of items

Steps to Reproduce (for bugs)

Extra bit of info I dont know if matters:I carry multiple bags I have 1 on my back and 2-3 in my inventory for different things I had 2 of them on my hotbar at the time
1.Open bag move bag out of current hotbar slot without closing the bag pull out any item/'s
2.Close the bag go to the slot the bag is now in and open it and the items you removed are still there.
Also you can accidentally delete item/'s if you open the bag move the bag out of its slot and any item you put in before closing the bag will be deleted unless removed from the bag.

Not able to reproduce as of minecraft 1.12.2, mod version 1.0.20.20

can't move the bag while its opened, couldn't reproduce it on 1.12.2 aswell