Hi @b8two,
Sorry you’re having issues with your filesystem; I’ll let people more knowledgeable than me chip in here as I don’t want to risk data loss on your side as a result of my words. I do want to clarify the situation with regards to the version of Btrfs in Rockstor. In particular:
Although the btrfs-progs package in Leap 15.2 is indeed based on 4.19.1, it is continuously updated and receives a ton of backports from the newer versions to this package. The same goes for the kernel, which means that a fully updated Leap 15.2 is not running a Btrfs stack from Dec 2018. You can see an example with more details in a now older post related to Leap 15.1 (the same principles apply):
This process can actually be considered as a big advantage of openSUSE Leap as it receives backports of important newer Btrfs updates once they have been deemed ready (secure, stable, etc…) to be backported.
Even though I’m not helping with your situation, I hope I could clarify a bit the situation about the version of the Btrfs stack you are running under Rockstor.