7 months ago - Shurenai - Direct link
Alpha 21
Major

.1
Minor

b16
Revision

Stable
A build that met conditions to be considered as a candidate for public consumption- AKA, Done; No additional work is being done on A21.1 b16; The next release will be some version higher than 16; ie, b17, or b44; Or the next Minor version will release and the specific build number for that minor version may be lower than 16, since the build numbers are version specific. Given that this is the Stable builds, it will be A21.2 bxyz that releases next, they aren't going to push another build under A21.1 on the stable branch.

Also, 'b16' is BUILD 16, Not BETA 16, if that helps clarify your misunderstanding a little.