Confirmed again. Jump off a set of stairs in the construction yard, and your pants (not sure about chest items) and everything inside them will become ruined.

DayZ Logic, where jumping 5ft breaks your legs so bad, the bones split out and destroy your pants.

I agree with Keller. I've jumped off of higher distances in real life than would kill the player in this game. Maybe a hurt ankle at most, definitely sores in the morning, but no broken bones, let alone death. If you landed wrong, maybe it would break an ankle (limping animations ftw?), curable my morphine. But the chance it would break your leg should be small, not absolute.

Recently happened to me as well, one the 2nd floor of a barn. Very annoying, might have something to do with slower connections; loading the player location before it loads the environment, causing fall damage due to player falling through nothing.