The notification does not show the control buttons but they still work if you press the right area.
Using spotify, fresh OS, non-owner profile
UI issues like this are usually caused by issues upstream in AOSP. Based on what I've seen in GrapheneOS's repositories, GrapheneOS devs don't usually mess with UI stuff like this. I found a related issue in AOSP issue tracker here: https://issuetracker.google.com/issues/257265961. If the issue is fixed in AOSP, it'll be fixed in GrapheneOS.
This is a bug with some apps in user profiles. Unfortunately, it's been happening since Android 12.