: Go to your repository Settings > Secrets and variables > Actions and add a secret named ACTIONS_STEP_DEBUG with the value true .

If you see a segmentation error (e.g., Part 2 failed to upload ), you have a network issue or a file that changed during compression (race condition).

A cache "hit" that contains outdated or corrupted binaries is often harder to debug than a clean "miss." 3. Proposed Architecture for a Debug-Action-Cache Utility

debug-action-cache is a mindset + toolset for making caching transparent. Enable verbose logging, inspect via API, and run dry-restore jobs. Once you see exactly what key is generated, what files are stored, and why a hit/miss happens, fixing cache issues becomes straightforward.