I have an exact similar situation but I was wondering if the immigration would say something about that. if so, should I ask my employer to write me a latter of what happen or it's totally legal and everything. In my case the company website didn't update my status so my W-4 defaulted to single with 0 dependent. and you are right when I applied on 2019 tax return they gave me more money back than what they usually do because my W-4 was single which it was deducting more than the married status.
