No, MD should not be taxing your capital gains in 2021 since you were non-resident there in 2021. First be sure you are working in a MD non-resident return. In the "My Info" section you will indicate you only lived in NC in 2021. On the "My Info" summary page be sure to select that you earned money in another state and select "MD."
In the MD state interview answer the prior year tax return questions. Did you file in MD for 2020? If so what type of return..."Part-year" should be correct since you moved in Dec 2020.
Eventually you will arrive at a page to allocate the capital gains to the "NON-Maryland" state. It may have already populated for you. If not, you need to put in the capital gains amount that belongs to NC.
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