It appears that "busway" is a deprecated tag, which is likely why it wasn't rendering. :https://wiki.openstreetmap.org/wiki/Key:busway

lanes:bus=* and bus:lanes=* is used now, however,
"If the whole road is exclusively for busse, use regular access conditions: access=no + bus=designated ; motor_vehicle=no + bus=designated"

https://wiki.openstreetmap.org/wiki/Key:lanes:bus