I'm using 22.04.3 with zfs and I've had a myriad problems because of it. Mind you, not with zfs itself, that was working well, but with the fact that the Ubuntu installer created a 2GB bpool for /boot, which seemed plenty, but trust me, it isn't.
Tired of dealing with the system problems, I'll probably install Ubuntu 23.10 when it comes out. I thought that would be the end of zfs for me, but then I thought maybe they have actually made installer smarter this time, maybe it now makes a larger bpool or lets the user decide bpool size. Does anyone have any info on this?