You are right, I reconstruct the scenario and now it works perfectly fine. So it seem like I was too slow to provide the explosives

I placed a blueprint on a region where cliffs were(this area has full roboport coverage). At this point there were no cliff explosions inside the logistic network. The bots, which are loaded with the items they want to place now hover over the cliffs, which are marked for deconstruction. Now I added ...

You're right, the game didn't updated while my resart. It's fixed now

I just wanted to connect the first pipe of an underground pipe pair and the games tells me I can't do it because different types of fluids would mix, but they acutally wouldn't.