from_json not working on the existing documents

I am trying to update the document and I need to skip validations while updating the document. I have data in json format and I tried the following two ways.
1.

profile = Profile.objects({"id": profile_id}).get()
profile.update(**data)
profile.reload()
return profile

But the problem with this is I can't specify the validate False flag with this method.

profile = Profile.objects({"id": profile_id}).get()
profile = profile.from_json(json.dumps(data))
profile.id = profile_id
profile = profile.save(validate=False)
profile.reload()
return profile

To my surprise, this method is not updating the document at all. This returns the same old document. Am I doing something wrong or is this a bug in from_json method.

Note: I have a very long document which has a lot of embedded documents. so parsing json manually and creating all the objects and assigning them is not a feasible option to me.

Start by reproducing the two shown update paths with an existing Profile containing embedded documents, then inspect the from_json and save(validate=False) entry points. Compare the persisted document before and after each path; done means identifying whether the unchanged document is expected or fixing it with a regression test.