Seems to be related to bot_generator. A point entity that spawns a TFBot at around start or on command.
Properties for team and class don't seem to be affected, however by creating a logic_relay with an OnSpawn output, I was about to properly set them by sending the inputs SetClass and SetTeam
Of the outputs:
I could only get OnSpawned to fire. The !activator in the event-chain that fires the OnSpawned is the player of the bot that has been spawned.