This answer is not correct. I have filed a Delaware Resident tax return with and a Maryland Non-Resident tax return each of the last 3 years (filed 2023, 2022, and 2021 taxes) and the 2021 needed me to manually email it to Delaware after months of trying to figure out why i wasn't getting my refund, 2022 went through no issue, and 2023 taxes repeated the issue for 2021. I am filing my 2024 taxes now and who knows when i will get my return and how long i have to struggle with Delaware's tax office till they tell me to send in my Maryland one too. Once they get that one, its a matter of a few days till i get my refund.
