Quick summary

Switching the admin interface style generates a CORS error and an error panel.

Steps to reproduce

1. Visit one atomic site like https://wordpress.com/settings/general/__SITE__
2. Select "Default style" (if not already in that style)
3. Select "Classic style" and save
4. You will be directed to wp-admin.php. Now go back to /settings/general/__SITE__ and select "Defaul style"

What you expected to happen

This to not appear:

Access to XMLHttpRequest at 'https://wordpress.com/settings/general/__SITE__'
(redirected from 'https://public-api.wordpress.com/wpcom/v2/sites/__ID__/hosting/admin-interface?_envelope=1') 
from origin 'https://public-api.wordpress.com' has been blocked by CORS policy: Response to preflight request
doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

What actually happened

The switch happened, but the error appeared.

Impact

Most (> 50%)

Available workarounds?

No but the platform is still usable

If the above answer is "Yes...", outline the workaround.

No response

Platform (Simple and/or Atomic)

Atomic

Logs or notes

Chrome 128.0.6613.115
Site ID: 61074952