The other two pages in the magazine were dedicated to promoting the volume release.
Having a shorter chapter come out at the same time as the volume release is a thing that happens occasionally.
Cune has a bit of a history of cancelling series right in between volume releases, so the fact that it's still running doesn't necessarily make it safe until volume 2.
(They've also got a history of not actually officially cancelling them, but just having them disappear from the magazine, without an ending.)
Granted, those are both extremely rare and haven't happened in a while, but they HAVE happened.