@synijlymon @noelreports My thoughts exactly. There's also the possibility of GPS jamming/spoofing causing the drone to hit the wrong target or the drone simply malfunctioning.
Side note: GPS jamming/spoofing can explain some of Russia's civilian building hits. Not all though, as many Russian weapons feature robust inertial navigation, some even laser guidance or visual target recognition and those weapons have also been observed hitting civilian targets.