The irradiance maps are calculated first (in prepass mode) and then blended in the final pass to reduce flickering of the shadows due to random light bounces. When I follow guides on rendering animations with Vray, it's recommended to use the irradiance map for primary bounces, and light cache for secondary. Rendering any of these frames in single frame mode looks 100% correct. These are 3 adjacent frames with messed up GI. So I'm doing an animation of a bar being constructed in a room.
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