ODMSP Error: "Migration of ListContentType 'XXXXXXXXXXXXXXXXXXXX' was skipped because Document Custom no longer exists on target tenant" (4381066)

When running a SharePoint Migration task the following error is received:

"Migration of ListContentType 'XXXXXXXXXXXXXXXXXXXX' was skipped because Document Custom no longer exists on target tenant" 

The List Content Types mentioned in the error no longer exist in the target environment and therefore could not be applied to the corresponding lists or libraries. 

• Ensure that the List Content Types are not deleted in the target tenant during the migration process.
• If they were removed, re-migrating the site should copy the List Content Types again.