FT College student from Nebraska has W2s for less than $600 in MO and more than $3000 in Nebraska. Looks like MO income is showing up on NE state return. Is this right?

The WSs are for different companies and in different states.  MO looks like they don't require a state return for non-residents with less than $600 of MO income.  However, should the income earned in MO show up on the NE return?