This transparent bug come from Windows Blinds.
1. Clean instalation Windows 10 21H1 and all aplication work correct.
2. When install Windows Blinds then i see glass bug on some app.
3. When i disable skining from Windows Blinds setting then bug is disapre.
I think you misunderstood me.
WindowBlinds works correctly on all the previous versions of Windows 10.
It is not working correctly on the beta version of Windows 10 you are using because of a bug in that OS in how it handles requests for transparency. This bug is on the Microsoft side and should be reported to Microsoft as bugs in insider builds of Windows should be in the same way a bug with any other third party app on the current insider version of Windows would be.
We do not offer any support for insider releases of Windows due to the fact that the OS changes from build to build and silly bugs like this appear and (hopefully) disappear.