[Reg 6.8.3 -> 6.9.0] Failing QML Test on Windows with disabled screen

We have some QML test in our application using tryVerify, tryCompare and waitForRendering. They are build and run on the following conditions:

• Linux
  • GCC
  • Clang
• macOS
• Windows
  • GCC
  • MSVC

With Qt 6.8.3 everything works fine. But when we started to use Qt 6.9.0 only the test on Windows using MSVC started to fail in most cases. Only a small number of runs succeed.

We started to search for the problem. Hope we can provide a minimal example this week. Maybe there is already an idea which change can be responsible for that?