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It seems unlikely that the propeller could be struck without the drone's tail fins also being struck but the video doesn't let us see that part of the aircraft after the impact.
I can't help wondering if the bit of the video they are not showing us is the Reaper letting go of one of its own external tanks (which use the inboard pylons) as a response to the Russian fuel dumps. Obviously a design flaw if it can hit the propeller, but I don't know if they are designed as drop tanks.
My uneducated 2 cents. Experts flame away.