1099-NEC received from different state, not sure where to pay my state taxes!

I'm an Oregon resident and have a permanent job here from which I receive a W2. I did some contract work in Montana through a healthcare staffing company and received a 1099-NEC for which:

-Box 5 is blank

-Box 6 has a blank for the "StatePayer's state no." but right below it shows "OR Applied For"

-Box 7 shows a State income of $X amount (over $10,000)

 

This staffing company, based in Florida, is listed as the Payer on the 1099-NEC and otherwise I see no indication on the 1099-NEC about any evidence of me working in Montana

 

Do I just file taxes in Oregon and call it quits or do I have to file taxes in Montana as well (although I've already paid the 9.9% state income tax to Oregon via quarterly payments)?

 

Appreciate any input!