If a dot(.) is contained in version string after hyphen(-),
ex) 1.0.0-b.1
When uploading to AMO, checkbox Only publish this version to my beta channel. won’t appear.
When pre-release version number is up to 10,
ex) 1.0.0-b9 -> 1.0.0-b10
Add-on Manager won’t update automatically.
Please file bugs on AMO here. The first issue probably won’t be fixed because it can be worked around and we’re looking into retooling the beta version feature.
The second one appears not to be a bug, per the version comparison rules. I tried out the internal version comparison, and it’s showing the b10 version to be lower by those rules.