Defender disappears from ship list in TA

from GalCiv2 Forums
In my current TA game, I had 4 planets building Defender M1s, with several others having already built them. I just noticed that all 4 planets now report they are building nothing, and that the Defender M1 no longer shows up on the list of ships to build (no model of Defender at all is on the list).  Star Fury and Phoenix are still available, but no Defender.

Has anyone else seen this?  I could send in a saved game, but I'm not sure how many turns ago this happened.  It might have happened when I researched Medium Hulls, but that's just a guess.
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Reply #1 from GalCiv2 Forums Top
OK, when I clicked the turn button the Defender M2 appeared. What happened is that I had just traded techs, and one of the techs I traded made the Defender M1 automatically upgrade to the M2. What was so confusing was that after the trade, the Defender M1 dropped off the ship list, and the planets showed (in the Civ Manager colony list) as building nothing. IMHO the M1 should still have showed on the ship list and those planets should have still shown as building it, until the turn button was clicked and they shifted to the M2.