2nd in the bug here. I actually have some blockcloned data, f.e. steam uses it for all proton installs, but no issues other than the go build.
Holding off on 2.2 seems recommended, and if you're keeping critical data on OpenZFS it might be a good idea to give the issues a glance. The 2nd one might have the same underlying solution as an issue that has given me system freezes when closing in on ~90% pool usage using 2.1 on top of LUKS.