[Bug 260507] FreeBSD 13.0: zfs snapshot does not store a snapshot in the .zfs/snapshot directory

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260507

            Bug ID: 260507
           Summary: FreeBSD 13.0: zfs snapshot does not store a snapshot
                    in the .zfs/snapshot directory
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: yonas.yanfa@gmail.com

# Effects
FreeBSD 13.0

# Does not effect
FreeBSD 12.0

# How to reproduce

$ pkg install -y pwgen fish
$ fish
$ zfs create zroot/test
$ for i in (seq 1 100); pwgen -C --secure --symbols 100 | tee -a
/zroot/test/blah  > /dev/null; end
$ ls -la /zroot/test/blah
$ for i in (seq 1 100); pwgen -C --secure --symbols 100 | tee -a
/zroot/test/blah  > /dev/null; end
$ zfs set snapdir=visible zroot/test
$ zfs snapshot zroot/test@now
$ find /zroot/test/.zfs/
$ find /zroot/test/.zfs/snapshot/now/blah
$ cat /zroot/test/.zfs/snapshot/now/blah
$ truncate -s0 /zroot/test/blah
$ zfs rollback zroot/test@now
$ cat /zroot/test/blah

# Expected results

The test file, /zroot/test/blah, should contain a bunch of random text, and not
be empty.

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