For those who may have missed the info on Mantis, I'll copy and paste my description of what should happen below.
Basically, as long as issue
0002478 (the issue THIS thread is about) remains unfixed, the game is
NOT behaving like retail. The ending movies
ARE supposed to play, and the campaign is
NOT supposed to be marked as ended--if retail behavior is intact.
Honestly, the whole "campaign not ended" issue is kind of a distraction right now, as it isn't really an issue, and is mostly
unrelated to the end movie not playing. However, the ending movie not playing IS a pretty bad issue, as it also ends the campaign and forces the player to start from the very beginning while also robbing them of the ending "climax."

At the moment, when you fight your way to the ending battle through 30+ missions, the game basically says
"Oh did you think you WON?!? PSYCH!!! HAHAHA!!! No movie and back to the beginning for you!!! Muhahahaha! Sucka!!!"As Yarn mentioned above, the first possible ending (the good one), only happens if issue 0002478 is fixed and returned to its retail behavior (and the player jumps out *DURING* the supernova *AND* also jumps while *INSIDE* the node, but *BEFORE* the supernova hits the player's ship)--just in case that needed to be clarified.
If issue 0002478 is *not* fixed, then the campaign end behavior is *not* like retail, and the good end cutscene is *not* played--no matter what the player does in the campaign. (And the campaign is closed, forcing the player to start over from the beginning because the cutscene did not play.)
From what Yarn mentioned on possible ending 3 (player jumps out at the node before the supernova starts), it sounds like *that* would be the main thing to fix in regard to this 0002482 issue (even if that actually is the original retail behavior), since it closes the campaign and forces the player to start over if they accidentally hit "Alt+J" at the wrong place and time.