Created attachment 206966 [details]
It seems some detail / contour missing from the actual results after changing "non-composited contents" in CoordinatedLayerTreeHost.
Test results are attached to this bug.
Also I add other guys to cc for this bug whose worked on 3d-point-mapping in the past in bug 80315 and 104308.
Created attachment 206967 [details]
Created attachment 206969 [details]
Sorry, I was wrong about r149292, the problem just turned out after that patch. After running more tests, it seems the failure already existed before the changes.