Fix #4366: EmbeddedRecordsMixin embeds the record, not the snapshot

[dnachev]

The change replaces references to snapshot.record.serialize() with snapshot.serialize() in the EmbeddedRecordsMixin to ensure that the snapshot state is serialized rather than the current state of the record.

[pangratz]

LGTM, thanks @dnachev.

@wecc can you do a double check if this looks good to you as well?

[wecc]

👍

[pangratz]

thanks @wecc

@dnachev I would consider this a bugfix, can you update the commit message to something like [BUGFIX beta] Reuse snapshot when serializing embedded relationships... ?

[dnachev]

@pangratz I've changed the commit message. Let me know if you need something else.

[pangratz]

Thanks @dnachev