This one.
I was playing the mission Frankenstein's Monsters in the new BP:AoA release, and got the skip option after failing too many times. I chose the option to skip, but it took me back to the briefing for Frankenstein's Monsters again. The dialog did not reappear the next time I failed.
The problem is obviously a different one from Mantis 2000 as that on simply means the dialogue is appearing when it shouldn't.
I can't reproduce this issue. Skipping worked perfectly for me every time I tried it. I don't have AoA installed at the moment so maybe it's an issue with the campaign file having something different from my test file. If someone would post the relevant sections it would help me a lot.