Ravana "disappears" in Ravana EX

I was farming Ravana EX the other night and for some reason after Final Liberation, Ravana disappeared and I can't target / see his skill animations (Same like some S Rank Hunts that became invisible because of too much people)... but when he jumped to switch to Beetle Form I can see him again. This issue was totally on my side because the other 7 members of my party were just fine during post-Final Liberation Dragonfly Form.

Just wanna let the devs know and I hope it can help make them game better. Thanks :)