I've been playing around a bit only just noticed bosses have their own personal themes from watching videos on them
On the ps4, for dragonfly, klaus, bee queen, ancient guardian and toadstool I've confirmed multiple times that their themes dont play and just the generic fight theme for the season plays.
It might also happen to other bosses but at this time I can't confirm since I dont have a current world with them yet (3 nightmares, fuelweaver)
Steps to Reproduce
On the playstation, instigate a fight with a raid boss and hear casual fight music instead of their specific fight themes
This issue has not been confirmed by a developer yet.