As you alluded VA residency for tax purposes is established if you lived in VA for more than 183 days. Which conversely means you spent less than 183 in MI; the residency requirement there as well. However you were domiciled/resident of MI prior to the VA "residency" therefore part-year returns are correct.
You should put VA as your state of residency for 31 DEC 2020 and indicate you lived in another state (MI). The date of the move will be the first date you went to VA even though you may have gone back an forth throughout the year.
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