What I wonder is why the preview builds are in the release branch on if they aren’t stable (at least not stable enough to ratify people using it in production) or contain some crucial fixes like some have reported here.
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The release branch is extensively tested by our QA team and makes a great starting point for learning the engine or making your own games. We work hard to make releases stable and reliable
I’d probably go with a separate preview branch to avoid that people keeping their games on the presuming stable release branch (in order to keep it on the most recent version, not bothering with different major engine versions) to be welcomed with a preview that might breaks things (and given the issue that assets can’t be downgraded once upgraded to a newer version, only trough replacing the files with backup files which is very annoying).