Strange visual bug

I’ve been getting a visual bug and I don’t know how to fix it. Anyone got any idea?
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Did you bake the lighting? Also, hide your lights until these strange dots disappear, so you would know which one’s causing the problem. Make sure that there are no small gaps or creases between different parts of the ceiling. Make them overlap a little so no light can pass through.

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Oh, thanks. It was the directional light that I placed to work in the scene the one that gave problems.