What is "the sandboxing feature" you're talking about? The standard app sandbox built into android allows apps to discover each other for various purposes, and grapheneos doesn't do anything to attempt to plug this.
Apologies. I was thinking of Android user profiles which are available from mainline and (AFAIK) prevent the linked workaround from revealing any apps not installed in the same profile. So it's an example of an unfixed leak in Android but not (as I had previously implied) something that Graphene corrects.
Honestly the state of anti-fingerprinting (app, browser, and otherwise) is fairly abysmal but that's hardly limited to android or even mobile as a whole.
Apologies. I was thinking of Android user profiles which are available from mainline and (AFAIK) prevent the linked workaround from revealing any apps not installed in the same profile. So it's an example of an unfixed leak in Android but not (as I had previously implied) something that Graphene corrects.
Honestly the state of anti-fingerprinting (app, browser, and otherwise) is fairly abysmal but that's hardly limited to android or even mobile as a whole.