The default behavior has changed in zfs version 13.
The snapshots are not shown by default anymore, by invoking "zfs list".
To get the old behavior back, it is necessary to set the corresponding variable in zfs.
I don't have an system with Current running so im not sure about the name of the variable.
But i thing it's self explaining when see the name.
try: "zfs get all" and set the corresponding variable to :visible