Joints visible on the plaster!

Hello everyone,
I have an appointment with my site manager next week. Before that, I wanted to get some opinions and maybe someone has already had the same problem or at least seen it before.

The following problem:

When it rained extremely heavily last week and there was also a strong wind, our facade suddenly looked like this (see photo) – you could clearly see the joints of the stones on the plaster and slight cracks in the base area. Does anyone have any idea what this could be? Is there a construction defect here? For example, too thin LUP?

Information about the house:

Year built: 2016
Masonry: 30 cm Ytong, glued
Plaster: according to construction plan, 15mm LUP and 3mm top plaster

I am not an expert - and that does not look right to me.

Presumably 20 cm stones that form a nice thermal bridge and too little base plaster.

Write something about the wall structure

The OP does have - 30 cm Ytong, see his first post.

Basically, you can see this with every new building, but the extent here is relatively strong. However, I wouldn't worry about it now. CRACKS in the exterior plaster are not normal!

There are several Ytong houses in our new development area that look similar. Unfortunately, your gray as a color greatly enhances the effect.