New construction: Crack in the exterior plaster (KFW 55 house)

Hello everyone,

we are currently building. Over the weekend, we noticed a crack in the exterior plaster. The crack is about 20 - 30 cm long. It runs vertically.
Is this normal? Or should I be worried?

Best regards

Take a photo (please hold a measuring stick next to it) and determine crack width & crack depth (insert a thin nail). What is the wall construction? How long has the plaster been applied?