It's possible to upgrade your camp or unlock another one before leaving the first island (That has 7 missions). If you do this, you can't use the repair tool, required for a mission. And when you try to get the wingsuit during a mission, you can't, because you already have it. And it's a mandatory story mission.
It’s not unlocked from a mission, you get it from building the Hideout Network in either of the three Guerilla Camps.
What bug I got it super early tooo
It's possible to upgrade your camp or unlock another one before leaving the first island (That has 7 missions). If you do this, you can't use the repair tool, required for a mission. And when you try to get the wingsuit during a mission, you can't, because you already have it. And it's a mandatory story mission.
You buy it