Glad you got to my point in the end. Just as the main branch had updates from the 'official' 1.1.0 to whatever the current 'live' version is. Same goes with the beta branch, one doesn't exclude the other necessarily. Could they have only worked on 1.2.0-6 content only after 1.1.6? Sure, but that speaks to a whole other level of poor planning/management too.
If we're accounting time here, the span between 1.1.0 and beta 1.2.0, is as valid to account for as we would from 1.1.6 to 1.2.6, from 1.2.1 to 1.2.6, or from 1.2.6 to when it's finally live. Or are you supposing they haven't even touched/started working on beta 1.3.0 work at all until this 1.2 goes live?