As long as there are only stress cracks in the plaster, which can also occur on both sides, I see no problems. However, if the cracks are in the masonry, then something is wrong. Something serious. But I cannot imagine that now.
Is this about partition walls or load-bearing walls or maybe exterior walls?
You can get some plaster and apply it over the cracks in different spots. If the plaster cracks again, then you have a problem. This is often done to monitor the cracks.