Windows 7 Pro. Java version 8 update 201 I have seen this in a few of the latest snapshots. If a mob kills you, and you immediately respawn and return to the place where you are killed the mob/s will still be around, but will be invisible and will still attack. Often (but not always) the loot which you dropped upon death will also be invisible, but will fill your inventory if you walk over it. In the case of a village raid, this makes it impossible to progress as you will be returning to a raid where the Illagers are mostly invisible. (Sometimes, after they have killed you again, they can then be seen - but once you respawn they are again invisible. Re loading the game fixes this.)