Currently if you program something to happen on InputGrab, then you open your quick menu and release your Grab trigger, InputGrab doesn't call false and you can close the with grab released and never have to hold the trigger again.
At the very least, making opening the menu force an InputGrab(false) would resolve this problem, but I also don't quite see why we can't just make Input Events run while the quick menu is open.
This happens with both menus, the quick menu and the actual VRC menu (worlds, avatars, social, settings).