New faces created by close_holes filter set all new faces with wedge uv at 0.5

[SuX97]

I have a mesh with per-wedge UV and a associated texture image. After applying close_holes filter, some new faces is added to close holes, however the material and per-wedge UV set for those faces is not correct, I find the UVs of the newly add faces are set to be [0.5, 0.5](the center point of the image), and assigned a new material, while I actually want to get the uv by interpolating the uv of the nearby faces, and using the original material. How to fix this? Thanks!