The Painter cannot import the model when importing into Stager

The 3D mesh file is in obj format. After drawing with a pen or brush, when sending it to Stager for display, it shows that the model cannot be imported. However, if you go to the project configuration, change the import settings, remove the retention of the brush positions on the mesh, and re-import the mesh, it can be imported normally again. The cost is that it will change the position of my pen path. Is this a bug?