ContentItemContentFolderID is NULL for Content Items migrated with a custom mapping class

[twozero6]

After migrating a K13 database to XbyK 29.7.0, I tried to upgrade the DB to 30.0.0 and the SQL upgrade failed due to:

The ALTER TABLE statement conflicted with the CHECK constraint "CHECK_CMS_ContentItem_ContentItemIsReusable_ContentItemContentFolderID". The conflict occurred in database "redacted-xbyk-project", table "dbo.CMS_ContentItem".

When running the following query, all content items that were migrated through a custom mapping class are returned:

SELECT * FROM CMS_ContentItem WHERE ContentItemIsReusable = 1 and ContentItemContentFolderID IS NULL

In addition to setting the FolderID value during a migration, please give us an option to Set\Create a folder for each item as a part of the ClassMapping class.