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Solved it! So in analysing this, I realised that if a surface group has a parent space, it should be transformed by the transformation matrix of the parent space. Thus, I modified my code as such and it worked perfectly.

for aShadingSurface in shadingSurfaces:
            shadingFace = surfaceToFace(aShadingSurface)
            if aShadingSurface.shadingSurfaceGroup().is_initialized():
                shadingGroup = aShadingSurface.shadingSurfaceGroup().get()
                if shadingGroup.space().is_initialized():
                    space = shadingGroup.space().get()
                    osTransformation = space.transformation()
                    osTranslation = osTransformation.translation()
                    osMatrix = osTransformation.rotationMatrix()
                    rotation11 = osMatrix[0, 0]
                    rotation12 = osMatrix[0, 1]
                    rotation13 = osMatrix[0, 2]
                    rotation21 = osMatrix[1, 0]
                    rotation22 = osMatrix[1, 1]
                    rotation23 = osMatrix[1, 2]
                    rotation31 = osMatrix[2, 0]
                    rotation32 = osMatrix[2, 1]
                    rotation33 = osMatrix[2, 2]
                    shadingFace = topologic.TopologyUtility.Transform(shadingFace, osTranslation.x(), osTranslation.y(), osTranslation.z(), rotation11, rotation12, rotation13, rotation21, rotation22, rotation23, rotation31, rotation32, rotation33)
            shadingFaces.append(shadingFace)