Casting button gone again

I have a Samsung Galaxy s25+phone, and after my phone's latest update I notice the casting button is gone again. I have a Sony Bravia TV and I think it must use Chromecast? I use the Roku app for programs now as I like the convenience of just pressing play, but i still want all of the pluses FB+ offers and i like to schedule random workouts. Has the casting situation been figured out? Thanks in advance!