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There are a few potential reasons for this, depending on the specific build system and configuration being used:

1. The build system or tool being used may not support the pyproject.toml file, and thus may not recognize any changes made to it. In this case, the file may be ignored and the build process may proceed without any errors, but any changes made to the file will not have any effect on the build.

2. The pyproject.toml file may contain invalid or incompatible settings that cause the build to fail, but the build system may not provide a clear error message or notification. For example, if the file specifies a version of Python that is not installed on the system, the build may fail without providing any explanation or indication of the problem.

3. The pyproject.toml file may conflict with other configuration files or settings in the build environment, causing unexpected behavior or errors. For example, if the file specifies a different version of a dependency than another configuration file or command-line option, the build may fail or produce unexpected results.

4. The build system or tool may be configured to ignore certain files or directories, including the pyproject.toml file. In this case, any changes made to the file will be ignored and will not affect the build process.