"I would like to know why some of my projects have these stains, usually on the walls. Sometimes I manage to fix them, and I would like to understand the reason for this error."
It looks like the AI denoiser is not enabled. In the Bake tab, under the Post-processing section, please enable the AI denoiser. This should clear up the walls. You can either run the post-process again, or it will be applied during the next bake. If this doesn’t solve the issue, please send me a link to your scene so I can analyze it further.
I solve the problem by disabling ambient occlusion
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