Should the test runner remain at localhost during spec execution?

[An-dy1]

I'm trying to create a spec file that will log me into my app. The login uses a third party tool but is registered at the same high-level domain as my app (think login.company.org and app.company.org). A handful of redirects happens during the login process, and ultimately Cypress crashes without giving me much useful output during execution.

I noticed that during the test, the address of the Cypress runner switches from localhost to a version of my app url. See screenshots.

I can't find anywhere whether this is expected behavior or not. I'm wondering if it points to frame-busting being the culprit of my issue running the test?