Migration from phrecia to settlers deleted all unclaimed Kingsmarch mappers loot

Title pretty much explains it all. I hadn't played Settlers until the migration so there were no merging conflict that could explain the result.

Just in case it isn't clear what I am talking about:
https://i.imgur.com/Vnn5Lbo.jpeg
This empty row was filled with completed maps with loot ready to be claimed prior to the migration.

edit: Just to be clear I have already used the "migrate all" button. Everything was transferred except that loot.

I believe that type of stuff which is unclaimed ends up just being yeeted. It's always a good practice to claim rewards and stash them prior to migration.