Hi!
Can you shows us an example? Here is one from me, where it’s working (albeit with ZFS).
$ incus launch images:debian/12 mycontainer
Launching mycontainer
$ incus snapshot create mycontainer mysnapshot
$ incus snapshot list mycontainer
+------------+-----------------------+------------+----------+
| NAME | TAKEN AT | EXPIRES AT | STATEFUL |
+------------+-----------------------+------------+----------+
| mysnapshot | 2024/07/25 10:19 | | NO |
+------------+-----------------------+------------+----------+
$