Invisible enemies bug or WAI?

seekey

Yesterday i tried out the new class, the bard but i met a lots of problem starting at Neverdeath Graveyard. The so-called deathlock wrights and commanders, fangs, and later on Ebon Downs the soulslavers became invisible when i got closer than 80'. The Goblin werrens (if i remember well) quest on Icespire Peak sending the player to kill the related dungeon's boss but that goblin also becaming invisible in 80'. I could target the mention monsters but i couldn't avoid a lots of their attacks, and sometimes i almost got killed by the time I figured out where they were. Please look after this matter before letting that version of the game to the live server.