FG points are stored in world space in the FG map. Indeed, it is a point cloud like storage; I like to say its like a bucket of points with light information. BTW, maybe I'm misunderstanding, but how would an FG point be useful if it only had position but no light value?
Freeze is designed to be used with camera fly-through like animations. Moving characters means moving illumination. So those occluded FG points are calculated but are averaged with the other ones, likely more of them from frames without the occlusion, if your character moves quickly.
You could still try to freeze areas of points which do not have moving illumination.
Two ways to do that.
1) Make a pass that does not contain FG points (FG receive off) in the moving illumination areas
2) Use fg_copy's bounding box option to extract the FG points that you want to keep, and possbily remerge several of these extractions together with it, as well.
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