: Look for leaked PATH variables or system-specific absolute paths that vary between developer machines or CI runners.
However, this "black box" efficiency fails when the hash doesn't account for a hidden dependency, such as a hardcoded local path or a fluctuating timestamp. This leads to the dreaded "it works on my machine" bug, but at scale. Core Debugging Strategies debug-action-cache
If you're caching web assets or API responses within your actions, check the HTTP Cache Headers : Look for leaked PATH variables or system-specific
When you re-run the workflow, actions/cache will output detailed information about tar creation, size calculations, and upload/download processes. and upload/download processes.