I was wandering the nether and i bridged up to a ledge and was instantly forced down to 3 hearts like it thought I was actually falling that distance. This lead to a few more instances of falling one block and taking 3-4 hearts of fall damage. This lead to heavy tension as it happens randomly and there's no telling if it could kill the player ido have a recording however.       

Thank you for your time

~lethalbypass