Hi,
I am trying to bake a lightmap for the level in the screenshot but somehow weird artefacts and bleeding appear. The objects are all prefabs made with pro builder. Has anyone an idea what could cause those problems?
PD. My first post here so I hope I got all the information you need to help me 
Thanks a lot!!
Hey! Do you need realtime GI in your scene? If not, try disabling it and rebake. This could fix lightmap bleeding artifacts caused by low resolution clusters.
If that won’t remedy the issue, you might have a problem with overly aggressive Gaussian filtering. Try switching to Advanced filtering, and either tweak Gaussian filter parameters or switch to A-Trous filtering.
Thanks a lot for the reply.
At the end I reduced the number of lights and that fixed the problem.