There have been a series of beta releases since June. (For some reason, they say in the linked page that beta releases have only been available since August, but that's not correct).
I don't maintain software, but I've heard from multiple others that since betas are just dumped and things are quietly added, changed, and removed, it's difficult to trust a beta for development.
Things aren't quietly added/removed. Each release comes with updated release notes/changelog and typically points out things that are WIP or broken temporarily.