[debug] Resolved path: 'node_modules' -> '/home/runner/work/app/node_modules' [debug] Path exists: true [debug] Contents: [ 'react', 'lodash', '.bin' ] If you see Path exists: false , you know your working directory is wrong. Add working-directory: ./app to your step. You run a Windows runner and a Linux runner. They share the same cache key. Debug logs reveal:
A debug-action-cache log says:
Using debug-action-cache to find the exact key to delete: debug-action-cache
[debug] Download speed: 45.2 MB/s [debug] Parallel chunks: 4 [debug] Validation: SHA256 matches expected If you see Validation: SHA256 mismatch , your cache is corrupted (rare, but happens with network proxies). The solution is to delete the cache key. Let's map error symptoms to debug-action-cache insights. [debug] Resolved path: 'node_modules' ->