Military airplanes do crash, there are lots of crashes every year: https://www.defenseone.com/threats/2025/11/military-aircraft...
At war there's a lot more pressure on ground and air crews that can lead to more mistakes. Also the mission would be flown closer to the limits vs. training.
So... We don't know? If your question is whether that's a good guess/greater than zero probability then sure. Is it a certainty? No. The Iranians will claim they shot it down. The Americans may or may not admit and if they deny then people will say they're lying.