Regression: ReactOS setup fails to start from Wine Staging 4.8

At first, you need to have Linux with Wine Staging 4.8 installed and clear wineprefix created (I tested it with Ubuntu 16.04.6 LTS, but I think any other distro will fit too).

For reproducing this, just download needed ReactOS bootcd from https://iso.reactos.org/bootcd/, then extract it from 7z archive, mount in your Linux distro, go to reactos folder and launch reactos.exe.

Up to 0.4.11-dev-600-g9c64b57dc9bc55cdf73db0ea2ff1ac202d7c608c, it starts succesfully. 0.4.11-dev-601-g82117d21925e454893658d45f444843e77bdcb67 and 0.4.11-dev-602-gf7ee1e2ffd9221ccfa18dd49d66202be23192e11 builds are absent on iso.reactos.org (probably due to failed compiling). Since 0.4.11-dev-603-g4bf9f6fa4ac1ddf3be0c6ab0f6fbec5037efe258, which is present there, ReactOS setup fails to start due to supposedly missing txtsetup.sif, although that file is not missing in the image.

If to launch it from Terminal, there are some debug lines from ReactOS side, which may be a possible source of problem, one of them is:

DbgPrint says: (base/setup/lib/setuplib.c:454) NtOpenSymbolicLinkObject(Z) failed with Status 0x006cf6a4

See output.txt for deatails.

Also I tried to get a more informative log from Wine via WINEDEBUG=+all, but for some reason Wine Debugger crashes with memory dump when creating the log, before as setup shows an error, so log is not full. But nevertheless I attached it too. See wine.log.zip.

Maybe there are some debug channels which are not needed, so I can disable them?...