Some raster masks not exported to pdf (related to transforms on groups)

Summary:

PDF export not correctly. When I export this file to pdf, the pdf is completely wrong.

Steps to reproduce:

• open this file
• export as PDF

What happened?

The PDF is like this

What should have happened?

It should like this

Sample attachments: CU.pdf

Version Info:

- Inkscape Version: 1.0 (4035a4fb49, 2020-05-01) <!-- (run inkscape -V or copy from Help → About Inkscape, top right) -->
- Operating System: debian
- Operating System version: debian 10