Yes, it is Missouri source income.
Missouri defines Missouri source income as income received while living in Missouri, or obtained from Missouri sources.
Even though you are technically a Missouri non-resident, you said you received this retirement distribution during the brief time you resided there. That would make it Missouri income.
You should check the state that is listed in box 15 of your 1099-R. If that says MO, it will be counted a MO income and you should list it as such on your MO-NRI.
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