For reference, Game Build v 1.03-beta7b; Scenario Build v1.01a - 2nd of June; Last Game Build used 103-beta7b; Scenario Version Number #16. I am running a Win 10 Pro 64bit, Intel i7-1065G7, 16GB RAM. It is a Surface Pro 7, connected to 2560x1600 display monitor via USB-C. That's Intel Iris Plus integrated graphics.
Per the image, this Minor is my vassal, however the target is valid.
I can also propose Peace with other minors, but not all.
I am guessing, but perhaps my minor is at war with someone--so the game believes Propose peace is valid. The other Minors I am testing, are at war with my vassal. Just guessing based on geographic location of behavior.
Finally, the "At War With" report under Reports > Regimes > (Regime Name) Overview. For all Minors, it always reports Unknown in my game. For Majors it appears to report accurately.
