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Issue Description:

you have to drop the backpack then right click and you will be able to have the GUI open
and the backpack on the floor, in then gui backpack take the items
then pickup the backpack and right click it you will be able to take those items as well

What happens:

Essentially drop the backpack while fast right click you will have gui open and backpack on the floor
being able to drop

What you expected to happen:

Dupe items

Steps to reproduce (important):

1. first put items in the backpack
2. drop the backpack while you right click at the same time
3. you will have the gui open take the items out and pickup backpack that was drop and take those items out
   ...

Affected Versions (Do not use "latest"):

• IronBackpacks: 3.0.1-2
• Minecraft: 1.12.2
• Forge: 1.12.2-14.23.0.2550
• Other Conflicting Mods (may be irrelevant to your issue):

Duplicate of #176 for reference, which was the same bug in 1.10.

We will look into it. Thank you for the bug report.

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