So, after my last game (DL, version 1.53), I was randomly going through the debug.err file to read up on the AI's tech trading, and I came across something weird. One of the tech trades was:
Debug Message: Year: 2232. Snathi traded Shields to the Pirates! in exchange for Impulse Drive
This is truly bizarre. Not only is it impossible to communicate with the pirates in any fashion, as they don't have planets, but the only pirates to appear all game were those that popped up after a breakout on the UP Galactic Prison in 2227 or so. I destroyed them all in a few turns, which makes me wonder just what was going on here.
This had no effect on the game, which I played without errors for some time afterward, and the Snathi are now dead. Nonetheless it seemed very strange and I thought I might as well report it. The debug messages before and after this were normal enough.