nano banana missing in generative fill

when i click the generative fill button in photoshop, theres an Icon that says "fi" which stands for firefly. ive been able to click that in the past and choose nano banana / gemini 2.5. but this time when i click it, Firefly is the only option and nano banana gemini 2.5 isnt there any more. where did it go? how do i get it back? im on photoshop 2025 version "26.11.6"