Comment 4 for bug 1926196

I tested with Xubuntu 21.04 iso and confirm the reported issue. Below is what I tried.

1) Install with lvm+encryption option.
2) Note down the recovery key.
3) At next boot, use recovery key instead of passphrase that we set.
4) The key unlocks the disk and we are able to login.
5) Once logged in, used 'luksChangekey' option to change the recovery key. Reboot.
6) Use the new (changed) recovery key. Key unlocks and able to boot into system.

Re-did the test but now with ZFS+encryption option. Step 3) fails to unlock the disk if we use recovery key. After 3 failed attempts, we are dropped to initramfs (busybox) prompt.

Decryption is OK if we use the passphrase we set.

Screenshots are attached below.