When setting the current_output_routing on multiple tracks, only the first track in the selection updates in the API.
It happens in 2 instances:
1: manually selecting and choosing your routing from I/O box in Ableton
2: using Live API to set current_output_routing with [live.object]
In the I/O of Ableton the tracks appear to have been routed, and audio passes to correct places.
But when a 'get' command is used afterwards on [live.object] of same selected tracks. Only the first track in the selection shows it has updated.