Check Google Street View
a no right turn, except for buses.
Welcome to the real world of Waze, where people use Waze on buses, taxis, bicycles and planes!
I've changed that to from a plain no right to a restricted turn 24/7 for everything except buses. However, since Waze currently considers user to be driving a private vehicle, this won't actually change the routing at all, or prevent Map Problems.
MPs are a great tool to suggest things that might need looking at, but you should always consider that one of the viable and likely situations is that nothing really needs changing at all.