For your personal taxes, you only file Missouri. Kansas did repeal it's pass-through entity exemption, but it still doesn't affect you as a nonresident. From a very respected organization comes this excerpt:
Kansas nonresident Withholding Requirements
In 2014, S.B. 265 had removed the requirement that subchapter S corporations, partnerships, and limited liability companies withhold Kansas income tax on nonresident shareholders’, partners’, and members’ share of Kansas source income. This repeal of withholding requirements was primarily due to the exemption of pass-through income from state income taxation that was enacted in 2012; however, despite this exemption’s repeal under S.B. 30, Kansas has yet to enact any new legislation to reinstate the withholding requirement. As such, currently there is no requirement that pass-through entities in Kansas withhold tax on the income of nonresidents. (Italics added)
While the partnership return may have had requirements in both MO and KS, on your personal return your income is not Kansas sourced, because you have earned it entirely in Missouri under current Kansas law.
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