Custom properties are not set on the Window object in Cypress 12 and Nuxt 2

[edgarkanyes]

I am upgrading a Nuxt v2 application from Cypress v8.7 to v12.4.0.

In Cypress 8.7, I could access a property set on the window object in the browser console while running tests. For example, I could access the getAppName property by setting it via a nuxt plugin on the window object.

import { Context } from '@nuxt/types';

export default ({ app }: Context) => {
  window.getAppName = 'myApp';
}

In Cypress v12.4.0, this does not work. window.getAppName returns undefined when I run it on the console of a running cypress test. As a consequence, I cannot access it with cy.window().

Is this a bug? How can I approach it differently?