Right now info on what happened is really scarce. At least in the clashes few days ago, it would seem there aren't any PLA casualties, since in general social media tends to lit up whenever a soldier dies in the line of duty.
Given the captured Indian forces and number of casualties... Its really doubtful this was some sort of melee like Indian media claims, that seems like a lie to deeascalate, so China might not want to challenge it either.
It sounds like an Indian force pressed too far and maybe mistook an Army position for something else.