From what you reported, that seems correct. Since you filed Part Year Resident Returns for both Missouri and Arizona in 2021, did you prepare AZ first?
Since your employer wrongfully withheld AZ tax on your income (since you didn't earn it while living in AZ), your W-2 makes it seems as though you earned 20K there.
Here's more info on How to File a Part Year Resident Return.
@JR108
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