ZFS list showing unknown partitions with legacy mountpoints

Hello,

Recently, I examined my pools (e.g. ZFS list) a bunch of partitions were created were created under a single pool. For instance...

scratch 5.53T 22.3T 148K /scratch scratch/enc 5.53T 22.3T 5.53T /scratch/enc scratch/enc/0220367be5331bd3fb901b10204ba324d976e8301ad9d769184d5591a1880768 4.98M 22.3T 635M legacy scratch/enc/0220367be5331bd3fb901b10204ba324d976e8301ad9d769184d5591a1880768-init 368K 22.3T 635M legacy scratch/enc/02567d2a3e62a394315a8dd7566c03baedca4ce24fb64d24f9e3b04790824af5 312K 22.3T 1.44G legacy

zpool list shows this pool is now fragmented, which I never noticed before.

NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT scratch 27.9T 5.53T 22.4T - - 4% 19% 1.00x ONLINE -

The health of the drives look fine. What am I looking at?

Thank you!