When I am trying to tower upwards (jump stacking) lag is causing random fall damage. Has caused me to die as well as take numerous irritating instances of random fall damage. I saw another report saying they were being pushed to the side when doing this, however I have died upon a really tall stack of blocks that's probably going to despawn my items by the time I get back that high (would have sucked way less to fall to the ground) with the random fall damage/death happening. There's no way to do it safely quickly enough.

Super inconvenient bug, has only been happening since recent update, but has happened enough times that it's really stuck a stick in my spokes.