Nightly end-to-end tests sometimes give the following failure message:

Timed out while checking if mirror iteration has been created

The test is supposed to try several times to see if the mirrors have been created. Since this process is asynchronous on the backend, the frontend has no idea when the iterations will actually be created, so we resorted to "check and reload", with a maximum of 11 attempts. After investigation, it appears the test fails the first check, and the reload does not work as intended, so it reaches the maximum attempts and fails. We should fix the test.