So different versions of the product have different ZFS versions and different pool flags. Once a pool has been updated to a newer set of flags it is not longer compatible with prior versions.
Assuming the pool is still present on the disk
I would suggest returning to SCALE importing the pool, the looking at a different storage of the data during your system migration.
Also thought I’d highlight the following incase these options might help you get what you were looking for on scale:
big changes coming to apps this year, in the announcement,
another option is to use the sandboxes