Migration error

I guess you could make a snapshot, remove the offending keys, do the migration, check consistency, add the keys back (if needed).

Sounds very familiar, similar errors were found when migrating from early M3 versions to late M3 versions for Mautic instances previously migrated from M2 to M3 due to a problem in the M2 to M3 migration code that was dormant until you needed to upgrade to a newer M3 version.

Could this still be related?

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