Pixelmon Mod

That's pretty much it. The default keybind is F3 + W and can easily be triggered by accident when walking or using mounts (like to check co-ords). There's already been plenty of confusion in the Discord, and changing it to a non-movement key would be much preferred. Either that or as mentioned by Sky, make it act like Minecraft's F3 debug menu keys where it will only activate if F3 is already being pressed, not holding the key then pressing F3.

Found this thread after accidentally pressing the keys. Doesn't appear to show up in F3 + Q either