The main module disappeared in a crater on the moon (Anno 2205)

Hello everybody.
On the moon, you can develop only in craters, there is an initial module-dome from which everything else begins. So here's the problem, or is it a bug, built up the entire crater, built a big energy blog, then bam! on all buildings there is a badge that there is no connection with the road and the dome. I was very surprised at Th for garbage, but then I noticed that the main module simply disappeared, how can it be so simple. I had to rebuild again in another crater, and again. Who faced this, we can know the reason.