Not exactly. The production of Beta1 started last thursday. Cauldron got frozen, synced to an internal repo, and that is used to build the isos.
As Beta1 is released to the public next Tuesday, currently it's undergoing internal QA and for that there are several iterations of builds needed,
and for that, also often some specific problems get fixed in cauldron packages, after which a resync from cauldron is needed.
BUT if cauldron changed otherwise during that time (new versions of many packages, configuration changes etc.) then that makes it really
hard to build those isos due to all those unrelated changes, do you comprehend?
Big blocker bugs (like the kernel one, or the one with dracut) will definitely get fixed during this process. Because where's the point in releasing a Beta1 to the public, which boots nowhere?