Hello, CommunityToday we faced with issue related to one of migration steps. RemoveOrphanedMetaKeysStep works with table MetaKey and after executing it should remove all orphaned data. This step works only with products, but in your solution you can use metafield with type StringDictionary for another entities (for example Purchase Order, Shopping cart).So after executing this step all data from tables MetaStringDictionaryValue, MetaMultiValueDictionary, MetaObjectValue, MetaFileValue which is not related to product content will be removed.Thank you.
We will look into this. Thank you for bringing it into our attention.