Cracks in the filigree ceiling are likely to continue spreading

Greetings! We have filigree ceilings in the house. I noticed fine hairline cracks some time ago. Approximately 0.1 to 0.2mm wide. These run diagonally through the rooms and are several meters long. I have not paid much attention to these cracks until now. However, today I noticed that these cracks apparently are moving. The joints of the panels were filled with putty, and I could see that the cracks reopen there. We now have screed in and the heating program is almost finished. I am now wondering whether I should get an expert to take a closer look at the whole thing. What do you think? Regards

Up to 0.4 mm no defect if nothing special has been agreed. Fleece on the ceiling and that's it.

Every paint covers small cracks. Nevertheless, it's unsettling where that comes from.

Is not alarming but completely normal. Color does not close that.

It is not alarming but completely normal. Paint does not close that.

Sorry but what is normal for you is not for me. And why should paint not close cracks? Buy proper paint, then it will work :)

Yes, if you have no idea and just blabber on you can certainly do that. "Rissweite Beton Hochbau" can be googled and someone might still invent crack-bridging paint... who knows.