Invisible Bosses

Reign of Dragons Echo
Quest Echos (all 3)
First Echo - Dragon that has ~20% hp was invisible, could still see his fire ring, his abilities as he used them, and he did die just spamming attacks.
Second Echo - all 3 dragons were invisible
Third Echo - Emperor of Corpses Invisible, adds spawned visible

i don’t know if it’s related but…
T4 Julra has disappeared on me several times. seems possibly due to being at the edge of the traversable area after a switch?
Also, shade of orobos frequently disjoints his location–he’ll teleport and his body wont move but he will be somewhere else. seems related to failing to start the teleport animation correctly