I wasn't the one to find this. This was discovered by a friend with the client.
Brief Description of the Bug: The Throwpot module doesn't work if you use the right-mouse button/M2 as the keybind. Whenever you try to tap it in combat to consume a soup/pot, it just drops/throws the soup/pot without consuming it. Only 2 or so soups/pots in the entire hotbar will be consumed, all the others will be dropped..
How to Reproduce the Bug: Toggle the Throwpot module, set M2 as keybind, log onto a PvP server and challenge someone to a 1v1.
Video/Screenshot of the Bug: If it's necessary, I will ask him for one later.
It's worth noting that this is only the case if you're fighting someone. If you jump into a pool of lava and start repeatedly pressing M2, it will consume the soup/pots perfectly and heal you just as it'd with any other keybind. Even more exquisitely, this bug is exclusive to Vape V3. The previous versions of Vape had that keybind work perfectly.