[2019] New building system is broken

Hey, since the new building system, that you need every 6 structures a connection to ground, the complete system is broken.

I have a ceiling, that is connected via wall AND pillar directly to the ground. I can place down a ceiling, no problem. But after a few mins, the ceilings starts to disappear and the pillar to the ground is directly next to that ceiling.

I have no clue, why they are disappearring from themself but I can place them. That is sooo frustating.