Ok, it seems apollo style missions are just doomed to fail. Just did another one to the mun arch. However again the 2 vessels (newly build) do not dock. The docked easilly and quick the first time around (assambling before transfer), but after the mun landing i was unable to dock again. Same as in the screenshot above. Even with perfect alignment and 0 speed between the vessels they just don't dock. So maybe the docking port is one time use only in KSP2?
Also the state of the lander remained landed whilst in space so had to use the cheat menu to get it "in orbit" again. One helpfull fact is that this saves you from editing the save files to change the state from landed to orbiting manually.
My mun is now orbited by 2 landers and 1 orbiter (another time the lander combined with the orbiter was told to have 0 dV) so i left the orbiter (had only one kerbal on bord that time). The other 2 times the lander was not capable of landing on kerbin and i had 3 kerbals so i took the orbiter home to kerbin. Planning was on both tries to do mun and minmus in one go, but the game won't let me.... Still a lot to be fixed by the devs sadly, but on the positive side, the game is now "playable" and enjoyable which is a big step up from pre v0.2