I finally managed to start a new 2.6 game. I play the Onyx as always and overall I cannot say that I notice too much difference in the first 150 turns of the game (apart from the fact that my randomly generated ludicrous galaxy has very few planets spaced far apart what I didn't ever have with my settings).
Anyway, here are the bugs and problems I still have (adding more if I find more):
- Station Garrison inserts itself at the end of the build queue every time it is finished, leading to unwanted stationing of legions if you forget to check on a planet with this project regularly.
- The problem with logistics when having a commander persists: in the Manage Fleet screen the commander logistics bonus is not taken into account correctly so that it's not possible to use the logistics bonus there.