Issue Description:

I added a mod called MineMenu that allows me to set up a radial menu. Unfortunately this mod's textures don't appear when I set them as icons. Well, they do, they just don't stay there when I restart my client.

What happens:

I set one of the options to use the keybind for opening a backpack - that's not the issue, just thought it might be good to know why I set the icon - and I set the standard iron backpack for its icon. It works perfectly fine... Until I relaunch the game, then the backpack gets replaced with the standard "texture missing" image. And yes, I tried with all the other textures, as well, including placing it in the other MineMenu slots.

What you expected to happen:

Obviously I expect for the image to carry over between sessions. The issue doesn't hinder gameplay at all, it's just a minor graphical nuisance that I need to reapply the texture upon startup.

Steps to reproduce (important):

1. With Iron Backpacks installed, download MineMenu.
2. Set the functions to whatever you like, just make sure you have at least one of them with an icon of an item from the Iron Backpacks mod.
3. Quit the game, then restart the client. Not even the launcher, just Minecraft itself. Once you open a world again, if you open the MineMenu interface the Iron Backpacks item will be replaced with a missing texture.

Affected Versions (Do not use "latest"):

• IronBackpacks: 1.12.2-3.0.8-12
• Minecraft: 1.12.2
• Forge: forge-1.12.2-14.23.5.2838
• Other Conflicting Mods (may be irrelevant to your issue): MineMenu v. 1.12.2-1.6.10-universal (also occurs with 1.6.9), I also have several other mods but I don't know which one it could possibly be if they're the case since I have over 70 in total. I also brought this up on the MineMenu issue page, but they said to report this here.