AA 2.0 beta - When copying, connected belts to area outside the selection break the input on buildings and splitters

[StarrrLiteNL]

When copying a selection that has belts going across the border of the selection, and the belt is connected to another building/splitter on the outside, after copying the connection point on the inside is broken and can not be connected to.

Steps to reproduce:

1. Place a splitter/building
2. place another splitter/building a little bit away
3. connect them with a belt
4. make a selection that includes 1 splitter/building, but not the other. Make sure the selection crosses the belt
5. Copy the selection
6. You will see that the connection on the splitter/building that used to have the belt is now broken in the copied part. You are unable to connect a belt to it anymore.

Short video showing the issue: https://www.youtube.com/watch?v=NiQU6GJ7nH0