I'm trying to let my kids do their lego-robotics coding (a tool called PyBricks). In vandium, a connection (seems to be) made but is dropped when the app tries to send the program. That's obviously the user-facing symptom only, not a triage attempt, which I'm really not sure how to do.
I was able to successfully test Chromium on two degoogled phones**, as well as desktop linux, where everything works. I also tried edge in a new/empty user profile, which also worked (but I hope to avoid, for the same reasons I'm on Graphene in the first place :) Most of the other chromium-based android browsers (DDG, Brave) don't support web-bluetooth at all. I can't find a way to install a stable, somewhat supported build of Chromium on Graphene, so I appear stuck with Vandium.
Is anyone using web-bluetooth for (anything) in Vandium? Any problems?