[Bug 49499] New: Ubuntu focal 5.11 packages translate unix working directory incorrectly when running dealer.exe (bridge utility)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49499

Bug ID: 49499
           Summary: Ubuntu focal 5.11 packages translate unix working
                    directory incorrectly when running dealer.exe (bridge
                    utility)
           Product: Packaging
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P2
         Component: wine-packages
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
      Distribution: ---

wine-devel and wine-staging 5.11~focal packages caused a regression where
running dealer.exe from terminal forwards incorrect working directory to
dealer.exe. dealer.exe is a small command line utility to generate constrained
hands for card game bridge.

The bug isn't present on wine binary if I compile wine-5.11 tagged version.
Neither it is present if I apply wine-staging patches to my wine tree and
compile it.

Downgrading 5.10~focal also works.

What is known about bug happening?
I'm running the application from a directory under my home directory. Wine maps
Z: drive to root ("/"). There is no other drives mapping to my home directory.
Package versions change working directory to root ("/").

dealer.exe enters application using wmain entry which translate wchar arguments
to multibyte handled by argument parser. After argument parsing it tries to use
freopen to redirect stdin to be read from the filename passed as argument.

I have no idea why wine 5.11 compiled from sources behaves differently to the
package version. I tried to look into
https://dl.winehq.org/wine-builds/ubuntu/dists/focal/main/source/wine-stagin...
but failed to spot a difference.

I tried to find wine built in command which would replicated same incorrect
working tree behavior. I failed to find any other application which would
reproduce the wrong working directory when run from same terminal.

Step to reproduce:
Dependencies: cmake and mingw cross compiler
1. git clone https://github.com/suokko/dealer.git
2. cd dealer
3. echo "set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSROOT $ENV{HOME}/buildd/win64)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(arch x86_64-w64-mingw32)
find_program(WINE_COMMAND wine)
set(CMAKE_CROSSCOMPILING ${WINE_COMMAND})
set(CMAKE_RC_COMPILER ${arch}-windres)
set(CMAKE_C_COMPILER ${arch}-gcc-posix)
set(CMAKE_CXX_COMPILER ${arch}-g++-posix)" > win32.cmake
4. mkdir build && cd build
5. cmake -CMAKE_TOOLCHAIN_FILE=../win32.cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo
..
6. export
WINEPATH="/usr/x86_64-w64-mingw32/lib;/usr/lib/gcc/x86_64-w64-mingw32/9.3-posix;$(pwd)/dds-install/bin"
7. make
8. cd ../Examples
9. wine ../build/dealer.exe Descr.test_operators

Failed output:
Descr.test_operators: No such file or directory

Expected output:
1 != 0: 1
5 - 2: 3
5 % 3: 2
5 == 3: 0
Frequency rnd(10):
    0       10034
    1       10122
    2        9974
    3       10003
    4        9884
    5        9977
    6        9853
    7       10036
    8       10142
    9        9975
Frequency :
Low      100000
Frequency :
High      100000
Generated 100000 hands
Produced 100000 hands
Initial random seed 1593633569
Time needed    0.000 sec