I also bit the bullet, and did the update from 2.11 (buildnumber 52149) to 2.12.
Thankfully, the game didn't confuse me with fixing the small sample of bugs I tested for.
I am still hitting invisible walls in my freighter / frigates, ships are still on fire in the hangar, freighter base building still yells 'invalid position' at me for what seem to be perfectly valid positions, but happily lets me build in totally invald positions (e.g. overlapping Large Hydroponic Trays, parts of Fleet Control Rooms protruding into other rooms, ...).
Also, the game is still too polite to at least burp a warning about eradicating my progress by deleting all Teleport locations other than my own base(s), if I dare change Galaxies.
But at least the one base I have for now seems to be still intact. Probably due to the fact, that it's a cube of metal walls with holes, because the game politely reminded me of things being invalid or limited, if I tried to get creative with more than a handful of Cuboid Rooms -- and I got a little sick of working around this. But maybe that got fixed. Alas, for now, I CBA to give that yet another try.
On a more positive note, I did not yet experience any new bugs. To my own surprise, I really wrote that last sentence with a straight face.
Edit: I don't run any mods, and did not fiddle with RemoveBaseBuildingRestrictions. I don't need the added risk, the game provides enough 'surprises' to me as it is :o)
Post edited September 19, 2019 by ksj8ak2