What @stavros-k said above about :latest also applies here:
He can correct me if I’m wrong but it feels like a lot of people are talking past each other here, so this is my understanding of the issue. :latest and :beta are both mutable. This doesn’t work for the TrueNAS apps catalog because the actual version being pulled by that tag can change without warning and the app maintainer does not get a chance to test or troubleshoot issues before rolling it out.
If you look at the screenshot someone posted in that thread:
three years ago emby apparently pushed an immutable beta tag for 4.8.0.30-beta, but since then has used the mutable beta.
On github, I see that emby does use the -beta suffix in the titles of their releases, but even there the actual tag is just the numbers
https://github.com/MediaBrowser/Emby.Releases/releases/tag/4.10.0.2
If emby tagged their versions with that suffix 4.10.0.2-beta, the bot could ignore those, but since they tag both the beta 4.10.0.2 and stable 4.9.3.0 with the same format, the bot can’t tell the difference.