Opening portals in the mission is bugged. The first portal opened up fine, the second took 1 shot of damage and became immune. No "immune" hit marks, not taking hits at all. The object still exists in the space as I can't jump through it, can stand on it, bullets hit, etc. I left to orbit and launched the mission again and the first portal took 2 bullets and then became immune. I'll update on my 3rd try.