Can't find element in the rewritten iframe via Selector.withText

[wentwrong]

After switching to the iframe with dynamically created document, TestCafe can't find the existing element:

AssertionError: expected false to be truthy

      + expected - actual

      -false
      +undefined


      Browser: Chrome 87.0.4280.141 / Windows 10 

          3 |fixture`Test`.page`http://localhost:3000/`;
          4 |
          5 |test('test', async t => {
          6 |    await t
          7 |        .switchToIframe('#frame')
       >  8 |        .expect(Selector('#test').withText('The Test Text').exists).ok();
          9 |});
         10 |

Although the element described by such selector present in the iframe. But if we replace "withText" method with "withExactText" then the test will pass successfully.

testcafe-iframe-bug.zip