Suspecting it's because of active EW jamming of GPS bc the airport was under drone attack. They probably don't have flight plans live feed at individual SAM crew level and confirm via ADSB feed instead which was way off here. So once it descended bellow certain FL it was misidentified as drone by the local Pantsir crew
most sensible explanation
https://web.archive.org/web/20241218234652/https://www.usaid...
Looks like a site for Aid for international development. One of the items Trump wants to eliminate.