diff --git a/libs/ng-mocks/src/lib/mock-render/mock-render.ts b/libs/ng-mocks/src/lib/mock-render/mock-render.ts
index 5559626f7f..69e524b7d5 100644
--- a/libs/ng-mocks/src/lib/mock-render/mock-render.ts
+++ b/libs/ng-mocks/src/lib/mock-render/mock-render.ts
@@ -50,7 +50,7 @@ const fixtureFactory = <T>(template: any, meta: Directive, params: any, flags: a
     template: mockTemplate,
   };
   const fixture: any = generateFixture({ ...meta, params, options });
-  if (flags.detectChanges) {
+  if (flags.detectChanges === undefined || flags.detectChanges) {
     fixture.detectChanges();
   }
 
diff --git a/tests/ng-mocks-render/cdr.spec.ts b/tests/ng-mocks-render/cdr.spec.ts
new file mode 100644
index 0000000000..a667284730
--- /dev/null
+++ b/tests/ng-mocks-render/cdr.spec.ts
@@ -0,0 +1,63 @@
+import { Component, OnInit } from '@angular/core';
+import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';
+
+@Component({
+  selector: 'target',
+  template: '{{ value }}',
+})
+class TargetComponent implements OnInit {
+  public value = '';
+
+  public ngOnInit(): void {
+    this.value = 'rendered';
+  }
+}
+
+describe('ng-mocks-render:cdr', () => {
+  ngMocks.faster();
+  beforeAll(() => MockBuilder(TargetComponent));
+
+  it('detects instantly w/o params and options', () => {
+    const fixture = MockRender(TargetComponent);
+    expect(ngMocks.formatText(fixture)).toEqual('rendered');
+  });
+
+  it('detects instantly w/ params and w/o options', () => {
+    const fixture = MockRender(TargetComponent, {});
+    expect(ngMocks.formatText(fixture)).toEqual('rendered');
+  });
+
+  it('detects instantly w/ params and w/ options', () => {
+    const fixture = MockRender(TargetComponent, {}, {});
+    expect(ngMocks.formatText(fixture)).toEqual('rendered');
+  });
+
+  it('detects instantly w/ params and w/ flag', () => {
+    const fixture = MockRender(
+      TargetComponent,
+      {},
+      {
+        detectChanges: true,
+      },
+    );
+    expect(ngMocks.formatText(fixture)).toEqual('rendered');
+  });
+
+  it('does not detect as a flag', () => {
+    const fixture = MockRender(TargetComponent, undefined, false);
+    expect(ngMocks.formatText(fixture)).toEqual('');
+
+    fixture.detectChanges();
+    expect(ngMocks.formatText(fixture)).toEqual('rendered');
+  });
+
+  it('does not detect as options', () => {
+    const fixture = MockRender(TargetComponent, undefined, {
+      detectChanges: false,
+    });
+    expect(ngMocks.formatText(fixture)).toEqual('');
+
+    fixture.detectChanges();
+    expect(ngMocks.formatText(fixture)).toEqual('rendered');
+  });
+});