Bug about "Analyze" button (1.49)

[Taera]

In my recent game i've encountered a not-very-nice bug.
Situation:
I am not a unit fan. I do not research Units, and therefore, Construction techs untill the mid-game.
So i didnt research Construction, nor fighters.
Suddenly an alien Carrier warped through damaging WP (=damaged carrier). I was pretty happy (free tech!) and built a boarding ship.
To avoid being caught by enemy's fighters i waited untill he warped through a warp point (and stopped there) and warped after him. Of course i captured the shieldless carrier.

Now the carrier had two techs i did not know: Cargo 2 and Fighters 1 (l. car, s. fighters).
So i sent the ship to nearest SY, unloaded the fighters and analyzed the carrier hoping to get at least 'construction' tech. I didnt put high hopes because the Research Potential was only "sizable".
OK, i scrapped. I go to the log and what do i see?
I received the following techs:
* Cargo lvl.2 (no wonder)
* Fighters 1 (ok..)
* Fighters 2!!!

AFAIR, I did not receive the Construction.
I see the reason that because i didnt have the tech but the analyze was "three technology levels i did not have" it just added me one more of the latest tech from the list.

Is this a bug? Was it fixed in Gold?