[LadyLightning]

Okay. So! I was invited to Seirina's party, and then to Kimiko's.
When either of them moved, I would teleport behind them.
Then Kimiko initiated PvP with Quinn, and Seirina, meanwhile,
absconded with poor Brynn to Cellsvich, pulling me out of the
battle!

This is the result, and note the battle hotbar:




When my turn comes up, things get really strange! Them
Papilions, I swear.



If I actually use the movement action, I can separate from her
by moving around Celly with battle movement. However, any
spells or attacks I select show no indicator and cannot be cast.
They can be cancelled with the X key, though.

Then I had Seirina take me to Zeo's, to see if I could talk with
NPCs during this little illusory projection trip. This, however,
was the result:



That's not Zeo's! When the battle ended, we were stuck in the
battle map, but not in battle mode, and could walk around in
it, but could not leave!



Ryu helped me escape the battle map by banning me for one
minute, to reset my location.

[Ryu-Kazuki]

And if it needs any further clarification. To replicate;

Be invited to a party
Be invited to another party while still in the first party (congrats, you're now now in two parties and when either of them move or engage in PvP, you jump between parties; or if like in the screenshots, you can be pulled across the map and your PvP actions work on the main map, hi SL1)
Take over the world

Basically, if you get invited to another party while in a party, it doesn't cut you from the first party. I think it should be so that if you are currently in a party, you shouldn't get party invites unless you leave the initial party first.

[Neus]

This should be corrected, but it's difficult to test on my own, so please test it when the update is live.