diff --git a/scripts/lib/install/apply.js b/scripts/lib/install/apply.js
index eac9bbb25..cde010a04 100644
--- a/scripts/lib/install/apply.js
+++ b/scripts/lib/install/apply.js
@@ -447,9 +447,11 @@ function openCodeActivationCandidates(plan, previousOperations) {
   return candidates;
 }
 
-function activationIsInactive(kind, operation, content) {
+function activationIsInactive(kind, operation, content, strict = false) {
   if (kind === 'plugin') {
-    return isInertOpenCodePluginStub(content);
+    // The final gate accepts only the V2-valid stub: the pre-fix one is inert but OpenCode rejects it.
+    return strict ? content.toString('utf8') === getDisabledOpenCodePluginContent()
+      : isInertOpenCodePluginStub(content);
   }
   const text = content.toString('utf8');
   const relativePath = operation.sourceRelativePath || operation.destinationPath;
@@ -505,7 +507,7 @@ function assertOpenCodeHookDeactivationReady(plan, options = {}) {
     const digest = content === null ? null : crypto.createHash('sha256').update(content).digest('hex');
     snapshot.set(key, digest);
     if (content === null) continue;
-    const inactive = activationIsInactive(kind, operation, content);
+    const inactive = activationIsInactive(kind, operation, content, options.requireInactive);
     if (options.requireInactive) {
       if (!inactive) {
         throw new Error(`OpenCode hook activation remains active at ${operation.destinationPath}`);
diff --git a/tests/lib/opencode-consent-legacy-lock.test.js b/tests/lib/opencode-consent-legacy-lock.test.js
index 8d92fec2a..48228307b 100644
--- a/tests/lib/opencode-consent-legacy-lock.test.js
+++ b/tests/lib/opencode-consent-legacy-lock.test.js
@@ -347,6 +347,25 @@ function runTests() {
     assert.strictEqual(fs.readFileSync(path.join(value.canonicalRoot, 'plugins/ecc-hooks.ts'), 'utf8'),
       getDisabledOpenCodePluginContent());
   });
+  test('a retained pre-fix declined factory stub never reports a successful repair', value => {
+    const state = addLegacyActivations(value, 'declined');
+    const oldStub = 'export default async () => ({});\n';
+    const stubPath = path.join(value.legacyRoot, 'plugins/ecc-hooks.ts');
+    fs.writeFileSync(stubPath, oldStub);
+    state.operations.find(operation => operation.destinationPath === stubPath).contentSha256 = sha256(oldStub);
+    writeInstallState(value.legacyStatePath, state);
+    const originalRename = fileSystem.renameSync;
+    fileSystem.renameSync = (from, ...args) => {
+      if (from === stubPath) throw Object.assign(new Error('Synthetic removal denial'), { code: 'EACCES' });
+      return originalRename(from, ...args);
+    };
+    try {
+      const result = repair(value, buildInertPayload);
+      assert.strictEqual(result.results[0].status, 'error', JSON.stringify(result));
+      assert.strictEqual(fs.readFileSync(stubPath, 'utf8'), oldStub);
+    } finally { fileSystem.renameSync = originalRename; }
+    assertBothLocksReleased(value);
+  });
   for (const defect of ['modified', 'missing-digest', 'source-mismatch', 'source-missing', 'symlink', 'unrecorded-alias', 'merge-json']) {
     test(`legacy ${defect} activation refuses before build and preserves ownership`, value => {
       const state = addLegacyActivations(value);