The last time I saw my party members they went to the El Nath Dead Mine

Description of the bug: (optional screenshot/video): Party members get invisible. The world map says that your party members are on another map (for example the next map), but they are on the same map. You share exp, Mesos and you can even heal your teammates. U can't see them and they can't see... the text u type in 'To All'.
What is supposed to happen?: See your party members. Lmao
Where did you find and/or notice this bug?: All the maps between Forest of Death Trees III and The Passage.
A step-by-step guide to re-producing this bug (optional): Idk it just happens randomly when u go through a portal. It doesn't happen all the time but sometimes it does.
Extra information (optional): The only solution to this problem that I found was to channel change. Once u do that u will get teleported to Forest of Death Trees IV and the problem is solved, hoping that people won't disappear the next portal u go in.