Correct, that’s a known bug on the new app that Homeassistent is using with the cast integration. It has been raised here: Cast media_players missing attributes in 2021.12.2 · Issue #62054 · home-assistant/core · GitHub
There is nothing I can do about it, I’ve downgraded my system to 2021.11 until this is fixed
Jkw
PS: it might help a comment to the GitHub ticket so the developer can see the magnitude of the issue … 