Zfs snapshots are empty dirs

Help
1

There are 3 datasets which are auto-snapshotted (zfs set com.sun:auto-snapshot=true “$ds”)
/home works
/persist and /ssync have empty dirs.
I tried changing ownership of /ssync and /ssync/.zfs to primary user instead of root but the newly created snapshot dirs are still empty and owned by root.

/ssync is symlinked to /home/username/ssync
/persist is impermanence

Do you have an idea why they are empty?

NAME                 USED  AVAIL     REFER  MOUNTPOINT
rpool                700G   199G      192K  none
rpool/local         37.2G   199G      192K  none
rpool/local/cache    192K   199G      192K  legacy
rpool/local/nix     27.3G   199G     27.3G  legacy
rpool/local/root    9.93G   199G     9.93G  legacy
rpool/reserved        25G   224G      192K  none
rpool/safe           638G   199G      192K  none
rpool/safe/home      315M   199G      267M  legacy
rpool/safe/persist   237G   199G      235G  legacy
rpool/safe/ssync     400G   199G      400G  legacy

λ zfs list -t snapshot                                                                                                                                          

NAME                                                          USED  AVAIL     REFER  MOUNTPOINT
rpool/local/root@blank                                        168K      -      192K  -
rpool/safe/home@blank                                         168K      -      192K  -
rpool/safe/home@zfs-auto-snap_weekly-2022-07-10-22h00U       11.5M      -      191M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-16-21h00U        808K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-16-22h00U          0B      -      256M  -
rpool/safe/home@zfs-auto-snap_daily-2022-07-16-22h00U           0B      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-09h02U        548K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-10h00U        504K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-11h00U        496K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-12h00U        644K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-13h00U        712K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-14h00U        792K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-15h23U        344K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-21h12U        324K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-22h00U          0B      -      256M  -
rpool/safe/home@zfs-auto-snap_daily-2022-07-17-22h00U           0B      -      256M  -
rpool/safe/home@zfs-auto-snap_weekly-2022-07-17-22h00U        104K      -      256M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-17-23h00U        800K      -      263M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-00h00U        484K      -      263M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-14h05U        548K      -      263M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-15h00U       1.12M      -      263M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-16h00U        516K      -      264M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-18h08U        484K      -      264M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-19h00U        664K      -      264M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-20h00U        524K      -      264M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-21h00U        556K      -      264M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-18-22h00U        0B      -      264M  -
rpool/safe/home@zfs-auto-snap_daily-2022-07-18-22h00U           0B      -      264M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-18-22h00U          0B      -      264M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-18-22h15U      460K      -      264M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-18-22h30U      388K      -      264M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-18-22h45U      280K      -      264M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-19-09h29U          0B      -      264M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-09h29U        0B      -      264M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-09h30U     1.14M      -      259M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-09h45U      296K      -      267M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-10h00U        0B      -      267M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-19-10h00U          0B      -      267M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-10h15U      244K      -      267M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-10h30U      240K      -      267M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-11h33U        0B      -      267M  -
rpool/safe/home@zfs-auto-snap_hourly-2022-07-19-11h33U          0B      -      267M  -
rpool/safe/home@zfs-auto-snap_frequent-2022-07-19-11h45U      244K      -      267M  -
rpool/safe/persist@zfs-auto-snap_weekly-2022-07-10-22h00U     956M      -      206G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-16-21h00U    6.62M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-16-22h00U     144K      -      230G  -
rpool/safe/persist@zfs-auto-snap_daily-2022-07-16-22h00U      144K      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-09h02U    5.71M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-10h00U    7.43M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-11h00U    6.86M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-12h00U    4.63M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-13h00U    5.94M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-14h00U    52.5M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-15h23U    5.34M      -      230G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-21h12U    16.6M      -      230G  -
rpool/safe/persist@zfs-auto-snap_weekly-2022-07-17-22h00U       0B      -      232G  -
rpool/safe/persist@zfs-auto-snap_daily-2022-07-17-22h00U        0B      -      232G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-22h00U     144K      -      232G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-17-23h00U    8.71M      -      232G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-00h00U    4.75M      -      232G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-14h05U    5.02M      -      232G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-15h00U    11.2M      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-16h00U    5.84M      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-18h08U    6.09M      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-19h00U    7.16M      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-20h00U    4.65M      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-21h00U    5.87M      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-18-22h00U     0B      -      234G  -
rpool/safe/persist@zfs-auto-snap_daily-2022-07-18-22h00U        0B      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-18-22h00U     152K      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-18-22h15U  4.09M      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-18-22h30U  2.95M      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-18-22h45U  4.39M      -      234G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-19-09h29U     152K      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-09h29U   152K      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-09h30U     3M      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-09h45U  5.58M      -      234G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-10h00U   152K      -      235G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-19-10h00U     152K      -      235G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-10h15U  1.57M      -      235G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-10h30U  1.47M      -      235G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-11h33U     0B      -      235G  -
rpool/safe/persist@zfs-auto-snap_hourly-2022-07-19-11h33U       0B      -      235G  -
rpool/safe/persist@zfs-auto-snap_frequent-2022-07-19-11h45U  11.0M      -      235G  -
rpool/safe/ssync@zfs-auto-snap_frequent-2022-07-19-09h45U    40.8M      -      400G  -
rpool/safe/ssync@zfs-auto-snap_hourly-2022-07-19-10h00U         0B      -      400G  -
rpool/safe/ssync@zfs-auto-snap_frequent-2022-07-19-10h00U       0B      -      400G  -
rpool/safe/ssync@zfs-auto-snap_frequent-2022-07-19-10h15U       0B      -      400G  -
rpool/safe/ssync@zfs-auto-snap_frequent-2022-07-19-10h30U       0B      -      400G  -
rpool/safe/ssync@zfs-auto-snap_frequent-2022-07-19-11h33U       0B      -      400G  -
rpool/safe/ssync@zfs-auto-snap_hourly-2022-07-19-11h33U         0B      -      400G  -
rpool/safe/ssync@zfs-auto-snap_frequent-2022-07-19-11h45U       0B      -      400G  -
2

cat /etc/fstab

# This is a generated file.  Do not edit!
#
# To make changes, edit the fileSystems and swapDevices NixOS options
# in your /etc/nixos/configuration.nix file.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>

# Filesystems.
rpool/local/root / zfs defaults 0 0
/dev/disk/by-uuid/25E2-AAAA /boot1 vfat nofail 0 2
/dev/disk/by-uuid/25E3-BBBB /boot2 vfat nofail 0 2
rpool/local/cache /cache zfs defaults 0 0
rpool/safe/persist /persist zfs defaults 0 0
/persist/etc/NetworkManager/system-connections /etc/NetworkManager/system-connections auto bind,x-gvfs-hide 0 0
rpool/safe/home /home zfs defaults 0 0
/persist/home/username/.cache/nix-index /home/username/.cache/nix-index auto bind,x-gvfs-hide 0 0
/persist/home/username/.cache/nvim /home/username/.cache/nvim auto bind,x-gvfs-hide 0 0
/persist/home/username/.config/youtube-subscription-downloader /home/username/.config/youtube-subscription-downloader auto bind,x-gvfs-hide 0 0
/persist/home/username/.local/share/Steam /home/username/.local/share/Steam auto bind,x-gvfs-hide 0 0
/persist/home/username/.local/share/direnv /home/username/.local/share/direnv auto bind,x-gvfs-hide 0 0
/persist/home/username/.local/share/fish /home/username/.local/share/fish auto bind,x-gvfs-hide 0 0
/persist/home/username/.local/share/nvim /home/username/.local/share/nvim auto bind,x-gvfs-hide 0 0
/persist/home/username/.local/share/zsh /home/username/.local/share/zsh auto bind,x-gvfs-hide 0 0
/persist/home/username/.mozilla /home/username/.mozilla auto bind,x-gvfs-hide 0 0
/persist/home/username/.ssh /home/username/.ssh auto bind,x-gvfs-hide 0 0
/persist/home/username/.thunderbird /home/username/.thunderbird auto bind,x-gvfs-hide 0 0
/persist/home/username/Android /home/username/Android auto bind,x-gvfs-hide 0 0
/persist/home/username/documents /home/username/documents auto bind,x-gvfs-hide 0 0
/persist/home/username/downloads /home/username/downloads auto bind,x-gvfs-hide 0 0
/persist/home/username/music /home/username/music auto bind,x-gvfs-hide 0 0
/persist/home/username/pictures /home/username/pictures auto bind,x-gvfs-hide 0 0
/persist/home/username/videos /home/username/videos auto bind,x-gvfs-hide 0 0
rpool/local/nix /nix zfs defaults 0 0
rpool/safe/ssync /ssync zfs defaults 0 0
/persist/var/lib/bluetooth /var/lib/bluetooth auto bind,x-gvfs-hide 0 0
/persist/var/lib/containers /var/lib/containers auto bind,x-gvfs-hide 0 0
/persist/var/lib/docker /var/lib/docker auto bind,x-gvfs-hide 0 0
/persist/var/lib/libvirt /var/lib/libvirt auto bind,x-gvfs-hide 0 0
/persist/var/lib/systemd/coredump /var/lib/systemd/coredump auto bind,x-gvfs-hide 0 0
/persist/var/lib/tailscale /var/lib/tailscale auto bind,x-gvfs-hide 0 0
/persist/var/lib/unbound /var/lib/unbound auto bind,x-gvfs-hide 0 0
/persist/var/log /var/log auto bind,x-gvfs-hide 0 0


# Swap devices.