Okay, this is a weird one.

As you can see here, I have MineMenu bound to "O:"

However, my options.txt file says: key_key.radial_menu:0

And when I attempt to call upon the keybind via Patchouli (which is how I discovered this), it says the keybind is "NONE."

However, actually using the key works just fine! I'm baffled, any ideas?

Ah, I figured it out. radial_menu is a keybinding from The Betweenlands. MineMenu's is open_menu.