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I debugged the issue, the problem are lazy loaded fields, since they don't get serialized without _fulldump. Also, when you add _fulldump for the session serialization, it get's removed later, cause \Pimcore\Tool\Session opens and closes the session like a million times per request... which unserializes it, removes the _fulldump and serializes it again.
Solutions might be:
The quick fix would be Solution 2.