In co players game grass floor tiles suddenly stopped snapping to framework - build impossible

I am hosting our game. My daughter joins and everything works just fine since more than a week.

We have built a longer bridge through the air using frames and grass floors on them. I can snap new frames and build them, put the grass floor on it and so on.

For my daughter beginning at a certain spot she can't attach new frames nor she can place new grass floors or grass floors on my built frames. Either frames and grass floors are staying red and don't snap to the existing parts. Also there are no snapping markers when hitting L.Ctrl. As I mentioned above the snap markers are working to a certain spot of the bridge. She can build everywhere else except from a certain step of the bridge we built.

Any ideas? Thanks in advance.

Edited February 7, 20214 yr by WulleBulle