Dredgers Bug? Mostly just curious...

Playing the dredgers mystery and was waiting on the dredgenaught (which I kinda wanted to see) when I run across a post saying Silva's mods are available. I saved and closed to the menu to get them (not authorized? oh well) and then came back only to find out that I failed to defeat the Dredgenaught and have gotten xyz breakthrough and abc technology.

It is a simple mystery that I hadn't seen before. And this bug(?) stopped me from experiencing the entire thing although there really wasn't much left.

Is this just the dredgers? Or do I need to take care about saving and closing with other mysteries?

Edit: Loaded an earlier save (2 hours before impact) and watched the countdown: 2h - 1h - 0h - Failed. It might be failing due to the dust storm? If it's a modified rocket, then it may not be able to land. If it can't land then I can't defeat it.

Edit 2: And nevermind? I once again loaded an earlier save and this time it landed just fine. Four or five reloads and it finally actually showed up. Easy mystery but that thing was damned creepy looking!