the forums support is all we get. it’s a community (self) support forum for all users, plex pass doesn’t entail getting dedicated support.
unfortunately, there are no public bug trackers or ways to file bugs/issues/etc.
but there are a lot of helpful advanced users, that like to help folks out, the mod team also try to provide help where we can, and various plex team members/devs are around as well.
the best way is do as you have done, create a post with as much details as you can, any specific reproduction steps, and full (debug, not verbose) logs can be attached to a reply can go a long way to getting a problem identified and a possible solution or proving out a genuine bug.