Feedback on a bug related to ExternalContour in VTK9.x version

The examples provided by the official website are used. See https://www.example.com for the example URL examples.vtk.org/site/Cxx/PolyData/ExternalContour/ The extracted contours in versions 9.0 and earlier were normal, as shown in figure figure90.png. However, in versions 9.1 and later, the extracted contours were deformed, as shown in figure figure9x.png. After debugging, it was found that the X and Y scaling ratios were inconsistent. It was further suspected that there might be a problem with the function vtkContourFilter or GetBounds. I hope this bug can be fixed in the new version, or there is another way, please help.