Were you parked at home, or out driving? I believe I read that when the car is on WiFi we will be getting Tidal's High Resolution, but when using the car's cellular connectivity it will be Tidal's ordinary resolution. Or perhaps not. The wording was a bit ambiguous, and I haven't relocated it.
(searching... searching... got it)
I dug something up:
2021.40.6 Official Tesla Release Notes - Software Updates
Why would it mention WiFi if the behavior on WiFi was not different compared to not on WiFi?