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I don't have an answer for your very strange issue, but I do have some pointers for your syntax. `cy.` commands are enqueued and run in sequence, so you don't need to use `.then()` unless you want to incorporate the previous command's yield with standard JavaScript.

So your test could be re-written as follows:
```js
import 'cypress-iframe';

describe('Install', () => {
it('should install Ricoch agent ',  function () {
  cy.visit("10.2.4.56")
  cy.get('frameset')
  cy.frameLoaded('frame[title="Header Area"]')
  cy.iframe('frame[title="Header Area"]')
    .find('span')
    .contains('Login')
    .wait(10000)
    .click({force: true})
    .wait(10000);
  })
})
```