When something hurts you and it is not a witch and you use the /effect give playername minecraft:instant_damage 1 3 command, it shows bugged death message. (death.attack.magic.player instead of player was killed by magic whilst trying to escape mob)

Note: Also works in 1.14, 1.14.1, 1.14.2, 1.14.3 and all of their pre-releases.