It's still only five. Also, there is a bug where the server will create separate instances for some of your party members whenever you do a map transition in a Foundry mission.
Pretty common. I've run into it every time I've tried to run a Foundry mission with a team. I believe the hosts of The Foundry Roundtable also ran into that issue during one of their last episodes.
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"No matter where you go...there you are."
"No matter where you go...there you are."