Compression is now on by default in recent OpenZFS. If you have reservations, you should probably run a one-liner like this one before upgrading your OS, be it current or stable/13.

zpool list -Ho name | xargs -n 1 zfs set compression=off

If you are curious and want to know what will happen, run this one-liner.

zpool list -Ho name | xargs -n 1 echo zfs set compression=off

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