Possible ground combat bug

[Q]

It seems the fighter are the problem. I ran a test game and there was no problem with mines, weapon platforms, sats or troops on the planet. But if fighters remained on the planet and were not launched, the attacking troops were ineffective.
I do not understand however why the computer im my original game did not launch the fighters automatically. Any ideas??
I mailed the savegame of the unmodified test game to MM.