Quest pawn arrived in "Spectator" faction

[CtrlAltDavid01]

Game version: 1.5.4402 (with only the Royalty and Biotech expansions) Mods: Latest Prepatcher from git repo, Multiplayer mod v0.10.5

We had a 2 player multiplayer going with sync time with both of us having our own faction. I hosted the game and this bug happened to me.

I got a quest where a pawn would join my colony immediately, but others were chasing her, so they will arrive later and raid me. I accepted it, the new pawn arrived, but I could not control her, because it wasn't in my faction. So I arrested her, but then I got a message that the relations with the faction "Spectator" lowered form 0 to -50.