Worked on the bazelbuild/bazel repository to enhance the reliability of dependency rollback workflows by addressing a bug in lockfile validation. Focused on refining the behavior of the --lockfile_mode=error flag so that only the user-visible workspace lockfile is validated, which eliminated false-positive errors during rollbacks. The solution involved backend development and comprehensive testing, utilizing both Java and Python to implement and verify the fix. Added targeted test coverage to guard against regressions and documented the changes in the release notes, ensuring users were informed of the update. This work improved CI stability and reduced unnecessary error reporting in Bazel.