DLC From The Ashes - XBoxOne - Never ending loading screen while trying to build extended Rathaus

I’m on XboxOne - when I try to extend the “Rathaus” I get a never ending loading screen after the locator said “we got all we need, let’s start etc”.
Tried it three times now, once via the book , and two times via speech options with the locator.
Everytime the game stuck in the loading screen.

[edit] Hard reset of the Xbox didn’t help. Trying again after doing something else (and saving somewhere else before trying again) didn’t help either.

Is this bug known, and are they any workarounds?

Quick update - I moved the whole game from the Xbox Internal HD to the External HD, tried it again and it works now.