Jumping from the default kernel with zfs to the xanmod kernel using a manually compiled version of zfs. I don’t rememeber a whole lot but it was quite… interesting. Next would be a suddenly vanished efi partition and my f* mainboard refusing to boot ZBM.
Bonus: my currently still unfixed problem is a very weird freezing/stuttering of the whole OS and the only (useless) “lead” I have is workqueue: fill_page_cache_func hogged CPU for >10000us 4 times, consider switching to WQ_UNBOUND