Ah, I see what happened here. There was a node with public_transport=platform as well as an area with public_transport=platform which represented the same feature in real life (a tram platform) but had the contradicting values for bin and wheelchair. When I combined them it resulted in the yes;no situation there is now.

Therefore I don't know which value is correct, as it was mapped inconsistently in the first place. I will survey the situation the next time I am in the area.

Thanks,
Alex