* Players cannot dismiss or add party members while undertaking exploratory missions.

[KarstenS]

Found a difference between english and german notes.

English:

When time has expired, or you choose to end the exploratory mission early, you can view a list of completed objectives.

German notes (translated by me):

When time has expired, or one player leaves the mission early, you can view a list of completed objectives.

So maybe "one player leaving will end the mission" could be a reason there is no kick?