For tax year 2023 you are a part-year resident of both states.
The income you earned in MA after you became a NH resident is still taxable by MA. MA can tax non-resident on income earned from work performed within MA.
When you complete your part-year MA return, be sure to allocate your full-year's work income to MA. I think that should solve the issue, although I don't have the MA state module on my computer so I can't test it out.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
