Worked on improving code coverage reliability in the aspect-build/rules_py repository by addressing a bug that caused Bazel coverage reports to be empty or incomplete across multiple targets. The solution involved introducing a new _lcov_merger attribute to py_base.attrs, enabling combined coverage reporting and ensuring accurate metrics for continuous integration and release processes. This targeted fix, implemented in Starlark and leveraging expertise in Bazel and build systems, reduced manual debugging and minimized false negatives in CI pipelines. The work focused on stabilizing the coverage workflow, enhancing visibility into test coverage, and supporting more dependable build and release readiness for the project.