[6.12.0] The compression setting is missing from an imported ZFS pool

I have a ZFS pool created via steini84's plugin. I remember I've follow the suggestion to enable the compression as lz4, like:

zfs set compression=lz4 myzpool

And I also remember I've ever confirmed this compression setting not long before. But today after I've imported my ZFS pool, I found the compression is shown as "off", no matter on the webUI or with command zfs get compression myzpool. Then I use the above set compression command again, and later I try get compression and see:

NAME     PROPERTY     VALUE           SOURCE
myzpool  compression  lz4             local

But in the webUI I see the compression is still "off". Am I doing anything wrong?

Any BTW is there anyway I can enable the automatic snapshots? Should I still use steini84's ZnapZend?