Quick summary

Randomly the Preview Feature Stopped Working Customizer Does Not Load the 2025 Theme and The Page Preview Displays a Default Page

Steps to reproduce

1. Open Studio
2. Turn Site On
3. Click Open Site link

What you expected to happen

1. I have access to my localhost WordPress Dashboard.
2. I can navigate in my localhost WordPress Dashboard.
3. I have access to Customizer Editor (Twenty Twenty-Five Theme doesn't load).
4. I have access to Block Editor.

What actually happened

1. Suddenly, in the middle of writing and testing, it stopped previewing the results.
2. The Customizer doesn't load the Twenty Twenty-Five theme, it keeps loading and displays nothing.
3. The Block Editor displays the content but can't update. When I try to update, it displays this error message: Updating failed. The response is not a valid JSON response. Therefore, it doesn't update the changes.
4. The content preview doesn't preview the page in the browser, instead, it shows a default page with the following text: Hello wp-now!.
5. Many items under the Directories and Sizes Tab in the Site Health Info are loading forever. Please see the attached images.
   
   

Impact

One

Available workarounds?

No but the app is still usable

Platform

Windows

Logs or notes

Using Google Chrome