I just got the DLC on PS4Pro (latest KSP-version, all standard settings) and have some problems playing the historical missions.
Right during the first mission: The Dawn of the Space Age: After successfully landing (Wernher told me so :)) the K-7 near (but not directly on the runway) the old airfield I return to the VAB either via the button at the top or via the mission diagram.
I build the K7-B and want to launch. But here I am sent back to the landen K-7 on the island. Here Wernher briefs me on the 48km-flight.
Somehow the spawning of new vehicles does not work,
From now on, when I manually return to the space center, all building are locked except the Observation building from where I just can return to the landen K-7.