Issue Description:

Backpack lost after sorting hotbar

What happens:

I was transferring items into the backpack and then just pressed the middle click to sort my inventory (not using the inventory tweaks mod)

What you expected to happen:

Steps to reproduce (important):

1. Enter the backpack GUI
2. Press the sort inventory button while in the GUI (On the hotbar ofc)

...

Affected Versions (Do not use "latest"):

• IronBackpacks:
• Minecraft:
• Forge:
• Other Conflicting Mods (may be irrelevant to your issue):

And your versions?

1.12.2 Minecraft, Forge is 14.23.1.2601 iron backpacks is 1.12.2-3.0.5-6

I was able to recreate it again in another save

Any other mods that may conflict? You running a modpack?

I've also came across this issue.

Steps to reproduce:

1. Open backpack GUI, having it on the hotbar
2. Press middle mouse button over the hotbar to sort it.

Affected versions:

1. Forge-1.12.2-14.23.2.2611-universal
2. IronBackpacks-1.12.2-3.0.5-6
3. inventorysorter-1.12.2-1.13.1+55

I have had this issue multiple times. The most recent occurred when I was placing an item from my hotbar into my backpack. I was holding down shift and mis-clicked the mouse wheel. The item I was trying to move disappeared as well as my backpack and all items in it.

FTB Direwolf20 1.12 v1.9

Lost 2 backpacks due to this earlier today, running Direwolf20 1.12

Would one of you mind providing either pictures, a gif, of a detailed set of step-by-step instructions to replicate this? It would help a lot, as I can't quite figure out how to do it myself with inventory sorter.

CC'ing @cpw - this might be on your end/require special handling, not sure yet.

Definitely happens on Direwolf20 1.12 for some reason. One of my users just reported losing a backpack mysteriously and this appears to be the most likely cause. I have yet to see it firsthand on account of not using backpacks myself and not going out of my way to test it but... there is a there there.
Any chance you guys are running Spongeforge when this is happening? Disregard this. I forgot to install sponge so it's irrelevant

Also, CPW probably isn't the right person to cc about Minecraft/forge issues at this point, on account of him quitting after Microsoft acquired MC. I'm not sure who is but unless something has changed, it's not him anymore