Total loss of ALL buildings after return to crossways

I got stuck at Welkins reach whilst trying to climb a mountain.

No way to move any direction I've tryed.

So I used the "Return to crossways" funktion of the map.

Reaching crossways I found the portal to Welkins reach closed, not only standby, closed.

So I walked on to my "Estate", where I left the card to open the portal, before I jumped to Welkins reach, just to find my estate cairn and everything else was gone.

Just if I've never have been there. (Sorry, I was too shocked for thinking of something like a screenshot)

Next thing I've tryed was a direct travelling to my respite point, even though it was not there.
Hey, why not.... worst thing could happen was a game crash followed by starting a new game.
But it did work.

I will try to reproduce that behaviour.