DX 11 Kinect PointCloud BlobExtraction Bug

I’m trying to use BlobExtraction (DX11.Pointcloud.Analysis PointcloudBuffer) to track people’s positions from above. When two people stand in a certain area of the kinect image in a certain distance from each other (about 1,5 - 2,0m) their Bounding Box vectors start randomly switching places in the output spread, but the Group ID spread stays in the same order. I can also see it in the debug texture: The two blobs switch their colors, but their group IDs stay were they are.
Does someone know a fix for this?

Edit: I found that the blob positions are constantly resorted by their depth value, while the Group IDs are sorted by age.

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