Why are there white spots like light in this enclosed space


I have a space that is closed off completely with no gaps, yet there’s white strokes(?) under the ceiling, why does this happen?

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It is one of the disadvantages of Roblox’s lighting technology. You can prevent this from happening by extruding all the walls surrounding the room.

Before:

After:

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Seems like 4 stud wall thickness is the minimum, but the corners will show light as you’ve seen.
As @eric said, just increase the size.

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