Cannot build a project with RunPythonCommand task from MSBuild/command line

[drolevar]

Cannot build a project with RunPythonCommand task from MSBuild/command line. The issue is a bit similar to #128.

Steps to Reproduce

1. Create a Python project.
2. Add a RunPythonCommand task inside CoreCompile target.
3. Build with MSBuild from command line.

The example is here.

Expected behavior The project should be build normally.

Result of MSBuild

MSBuild version 17.13.15+18b3035f6 for .NET Framework
Build started 11.04.2025 17:09:25.

Project "d:\Projects\MSBuildIssue\MSBuildIssue.sln" on node 1 (default targets).
ValidateSolutionConfiguration:
  Building solution configuration "Debug|Any CPU".
Project "d:\Projects\MSBuildIssue\MSBuildIssue.sln" (1) is building d:\Projects\MSBuildIssue\MSBuildIssue.pyproj" (2) on node 1 (default targets).
d:\Projects\MSBuildIssue\MSBuildIssue.pyproj(29,5): error : Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
d:\Projects\MSBuildIssue\MSBuildIssue.pyproj(29,5): error : Unable to resolve environment
Done Building Project "d:\Projects\MSBuildIssue\MSBuildIssue.pyproj" (default targets) -- FAILED.

Done Building Project "d:\Projects\MSBuildIssue\MSBuildIssue.sln" (default targets) -- FAILED.


Build FAILED.


"d:\Projects\MSBuildIssue\MSBuildIssue.sln" (default target) (1) ->
"d:\Projects\MSBuildIssue\MSBuildIssue.pyproj" (default target) (2) ->
(CoreCompile target) ->
  d:\Projects\MSBuildIssue\MSBuildIssue.pyproj(29,5): error : Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
  d:\Projects\MSBuildIssue\MSBuildIssue.pyproj(29,5): error : Unable to resolve environment

    0 Warning(s)
    2 Error(s)

Time Elapsed 00:00:00.36

Result of Visual Studio Build (rebuild)

Rebuild started at 17:26...
------ Rebuild All started: Project: MSBuildIssue, Configuration: Debug Any CPU ------
		Deleting file "D:\Projects\MSBuildIssue\obj\Any CPU\Debug\MSBuildIssue.pyproj.CoreCompileInputs.cache".
		Usage:   
  C:\Users\username\AppData\Local\Programs\Python\Python312\python.exe -m pip <command> [options]
Commands:
  install                     Install packages.
  download                    Download packages.
  uninstall                   Uninstall packages.
  freeze                      Output installed packages in requirements format.
  inspect                     Inspect the python environment.
  list                        List installed packages.
  show                        Show information about installed packages.
  check                       Verify installed packages have compatible dependencies.
  config                      Manage local and global configuration.
  search                      Search PyPI for packages.
  cache                       Inspect and manage pip's wheel cache.
  index                       Inspect information available from package indexes.
  wheel                       Build wheels from your requirements.
  hash                        Compute hashes of package archives.
  completion                  A helper command used for command completion.
  debug                       Show information useful for debugging.
  help                        Show help for commands.
General Options:
  -h, --help                  Show help.
  --debug                     Let unhandled exceptions propagate outside the
                              main subroutine, instead of logging them to
                              stderr.
  --isolated                  Run pip in an isolated mode, ignoring
                              environment variables and user configuration.
  --require-virtualenv        Allow pip to only run in a virtual environment;
                              exit with an error otherwise.
  --python <python>           Run pip with the specified Python interpreter.
  -v, --verbose               Give more output. Option is additive, and can be
                              used up to 3 times.
  -V, --version               Show version and exit.
  -q, --quiet                 Give less output. Option is additive, and can be
                              used up to 3 times (corresponding to WARNING,
                              ERROR, and CRITICAL logging levels).
  --log <path>                Path to a verbose appending log.
  --no-input                  Disable prompting for input.
  --keyring-provider <keyring_provider>
                              Enable the credential lookup via the keyring
                              library if user input is allowed. Specify which
                              mechanism to use [auto, disabled, import,
                              subprocess]. (default: auto)
  --proxy <proxy>             Specify a proxy in the form
                              scheme://[user:passwd@]proxy.server:port.
  --retries <retries>         Maximum number of retries each connection should
                              attempt (default 5 times).
  --timeout <sec>             Set the socket timeout (default 15 seconds).
  --exists-action <action>    Default action when a path already exists:
                              (s)witch, (i)gnore, (w)ipe, (b)ackup, (a)bort.
  --trusted-host <hostname>   Mark this host or host:port pair as trusted,
                              even though it does not have valid or any HTTPS.
  --cert <path>               Path to PEM-encoded CA certificate bundle. If
                              provided, overrides the default. See 'SSL
                              Certificate Verification' in pip documentation
                              for more information.
  --client-cert <path>        Path to SSL client certificate, a single file
                              containing the private key and the certificate
                              in PEM format.
  --cache-dir <dir>           Store the cache data in <dir>.
  --no-cache-dir              Disable the cache.
  --disable-pip-version-check
                              Don't periodically check PyPI to determine
                              whether a new version of pip is available for
                              download. Implied with --no-index.
  --no-color                  Suppress colored output.
  --no-python-version-warning
                              Silence deprecation warnings for upcoming
                              unsupported Pythons.
  --use-feature <feature>     Enable new functionality, that may be backward
                              incompatible.
  --use-deprecated <feature>  Enable deprecated functionality, that will be
                              removed in the future.
		MSBuildIssue -> 
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
========== Rebuild completed at 17:26 and took 01.468 seconds ==========