Merge 4b568c8023 into 58e6119fe4

src/install-pnpm/run.ts

@@ -101,8 +101,8 @@ Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_
   }
 
   if (typeof packageManager === 'string' && packageManager.startsWith('pnpm@')) {
-    // Strip the "pnpm@" prefix and any "+sha..." hash suffix
-    return packageManager.replace('pnpm@', '').replace(/\+.*$/, '')
+    // pnpm will handle version management via packageManager field
+    return undefined
   }
 
   if (!GITHUB_WORKSPACE) {