Multiple States W2

I live in Missouri and worked in Missouri for entire year 2021, however I received arrear payment in 2021 for the work I did in California back in 2016, in the arrear payment W2 I see CA is captured as state and rest of my W2s are for state MO.  As I did not work in CA for any duration in 2021, shall I file the W2 with CA state for the arrear payment under MO state tax filing or should I file separate CA state tax filing even though I did not work in CA or live in CA for any duration in 2021.  Please clarify.