Oh man and I thought it was a hint that the Canary Channel was finally moving back to rs_prerelease... If history is any indication, builds 29xxx should include every user facing feature that has been missing from Canary... (Including the new start menu...)
I was being ironic. As build 27950 is essentially a server build, with no new user-facing features whatsoever. It actually removes/reverts a feature LMFAO. Upside is, these builds are very stable.
Finally, the UUPDUMP ISO 27950.1 worked correctly for updating a canary system from 27943.1 to 27950.1. No more errors updating and/or opening Apps from MS Store like with previous 3 uupdump Canary Builds.