One scenario.... (please prove me wrong)

had this happen way to many times in KSP

sounds logical but maybe it was some moon goon who kicked it over

Wouldn’t hazard collision software have moved the lander away from a larger bolder before committing to landing?

This was my thought, or it shut down and was tilting but not falling… and then fell?

Totally false. It wasn't a rock, was Moon alien :P

Could another possibility be it tipped over first with the engine still thrusting, or is that inconsistent with what we heard?

Another one on its side?

This…

Would idle engine power be enough to hold it up? I think they said it was at idle