I was in a group with icarus, doing a combat mission
Got "stuck in loading"
Server disconnected me
I reconnected
And there I was, with a group mission, group mission status, but without a group to belong to. And the mission told me that icarus was part of it.

perhaps the server got nervous, seeing Icarus and Spider grouping up?

how did the mission tell you that Icarus was part of it? (if you couldn't see him in your group)

/group list
or perhaps he requested a mission update and it told how many bots icarus killed

group list told me I'm not part of any group
mission status told me icarus and I were the ones killing things

Should be fixed in the next update.