Pailaka 37-42 bug

[Voldren]

Everything starts ok, I kill first boss and go further. Im in front of the second boss (papion). From some distance, I see him normally, can target etc, but when I come closer he just disappear... He hits me, but I can't target him (ofc I tried '/target papion' ), basically it looks like he's using skill 'Hide' but doesn't appear after hitting me xD. Without killing him obviously further mobs ain't spawned so there's no way to finish quest in this case. Normally I'd just ignore it and go exp normally but this bug happened to me for the second time (previously on another account/char).

[Gezas]

enchant sword first, then  go to second raid