I know this has been reported before, but I have a save where the problem is repeatable.

When my survey ship investigated a Ship Graveyard, I did not get a notice that it was defended.  I was stuck with fighting the pirates.  Wow!  They are much more powerful now.  My survey ship destroyed one before being destroyed.  I used Alt-Tab to leave the game and get to my GalCiv3 directory.  I made a copy of the autosave, then went back to the game.  I loaded the autosave copy and investigated the Ship Graveyard again.  I still did not get a notice, had to fight and destroyed two pirate ships before being destroyed.  I reloaded the autosave copy and investigated the Ship Graveyard for the third time.  There was still no notification, and I lost again.

After today's video stream, I ran GC3 again, loaded the save, investigated again and got the same result again.

Save and other information submitted on Ticket #EXI-284-57864.