Honestly, the timing sounds a little suspicious to me. I'm half inclined to think the Russians rushed things to get to the lunar South Pole region first. And if that were the cause of the failure, that would be quite embarrassing. Fifty years ago, I don't think many people would have imagined that the Russian (Soviet) space program would one day be inferior to India's. But then, I doubt many people back then imagined that the United Kingdom's navy would end up being inferior to India's.