diff --git a/yarn/action.yml b/yarn/action.yml
index 87c94db..a8ac6c3 100644
--- a/yarn/action.yml
+++ b/yarn/action.yml
@@ -204,11 +204,17 @@ runs:
       if: ${{ failure() && steps.install-dependencies.conclusion == 'failure' }}
       shell: bash
       env:
-        CI: 0
-      run: yarn install
+        YARN_CHECKSUM_BEHAVIOR: update
+      run: |
+        yarn install
+        (
+          echo '# Bad `yarn.lock`'
+          echo 'This could be caused by bad locally cached packages.'
+          echo 'Try running: [`yarn cache clean --all`](https://yarnpkg.com/cli/cache/clean#options)'
+        ) >> "$GITHUB_STEP_SUMMARY"
       working-directory: ${{ inputs.working-directory }}
 
-    - name: Upload yarn.lock on failure
+    - name: Upload regenerated yarn.lock on failure
       if: ${{ failure() && steps.install-dependencies.conclusion == 'failure' }}
       uses: actions/upload-artifact@v4
       with: