GitHub? I don't think there's any other "official" space except reddit now. They probably have a discord or something out there, as infuriating as that is to have to use for support.
If there's a specific Tailscale support community around here beyond this one, I doubt it will be too populated or have the devs lurking.
@sem staffed support is on GitHub and the support team contactable at tailscale.com/support, Reddit, fediverse and IRC and so on we check in on periodically, but they’re mostly better for low urgency discussion / design topics as they’re not staffed.
@sem ideally just bugs and feature requests there - if you have e.g. architecture questions or the like our support team are true experts in those areas and very happy to help. There’s a good amount of community feedback for that kind of thing on Reddit too, but again, true expertise from our support team!