Black lines/artifact in final render - Movie Render Q.

Been getting these weird artifacts while rendering. Usually random positions also. Does anyone know if there is a fix for this?

From the angle and direction this line has, it looks like a part of a Light Shaft. Is there something that could cause such an intense shadow in that spot? Like a leaf or a tiny bird, that maybe should not cast shadows?
You could test, if or how they appear, if you turn off Light Shafts, or play with their intensity and bloom and tint settings.

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