Add-agent-buttons adds third element when rendering the view for apps (only in tests)

When working on https://github.com/solid/solid-ui/pull/232 I had to fix a test that broke. It's the test When "Add App" button is clicked > bar is simplified that is affected. It expects two elements to remain after Add App button is clicked, but for some reason three elements remain after the action.

This only happens in the test, I have not been able to reproduce it "manually".

I've tried to understand why this happens, but have succumbed to let it be for now, as there are more urgent matters to tend to. But creating this issue to track it, to revisit it when I have time, or if others are more lucky than me.

Comienza con la prueba When "Add App" button is clicked > bar is simplified mencionada en el issue y reproduce el fallo. Sigue el rendering realizado por la acción Add App para determinar por qué quedan tres elementos en la prueba; se considera terminado cuando la prueba observa de forma consistente dos elementos restantes sin romper el comportamiento relacionado.