I struggled real hard to get things to work. Dunno if I was just unlucky but trying twice to land on the Mun, once on Minmus, and none of those worked. Staging failed so lander was stuck to descent stage. Fuel burned evenly on all tanks in ALL stages, so none left for lander when it disconnected. Weird issues with staging where things got stretched and torn apart.
Then the first time I try for Duna and it worked? Go fig.
This game is fun... but still all over the place. Plus... that ship was just an overpowered Mun lander. Wasn't designed for Duna! The parachutes were for a return to Kerbin, not landing on Duna. But once I launched and found I had way more dV that had been indicated in the VAB I thought... why not?
So first landing in KSP 2 on Duna it seems. Ah well.
Footnote. I think Jeb and Val will be stuck on Duna for a very long holiday!