Looks different when using X forwarding to Windows10 high DPI display

When Qt applications run using X forwarding from Linux to Windows high DPI display, it looks different from usual.
Maybe, it looks that some objects is not expanded.

Details of attached files are follows,

First, it is good case, not expanded base case.
Test application is running and forwarding from Ubuntu to Windows X server without high DPI setting (dpi=96, same with 100%).

Second, it is good case, expanded correctly.
It is running with "QT_SCALE_FACTOR=1.75" prefix, and forwarding from Ubuntu to Windows X server without high DPI setting (dpi=96).

Third, it is bad case, expand incorrectly.
It is running and forwarding from Ubuntu to Windows X server with high DPI setting (dpi=168, same with 175%).

Last, Zip file is test codes.

• I also try these pattern, but there are same problem.
• from WSL Ubuntu 18.04 with Qt 5.9.5 to MobaXTerm (Windows 10)
• from WSL Ubuntu 18.04 with Qt 5.9.5 to VcXsrv (Windows 10)
• from WSL Ubuntu 19.10 with Qt 5.12.4 to MobaXTerm (Windows 10)
• from WSL Ubuntu 19.10 with Qt 5.14.1 to MobaXTerm (Windows 10)
• from Virtual Box Ubuntu 19.10 with Qt 5.12.4 to MobaXTerm (Windows 10)

And, this pattern is working correctly.

• from Virtual Box Ubuntu 19.10 with Qt 5.9.5 to another Virtual Box Ubuntu 19.10

It may be similar to QTBUG-55654.