After pressing this admin_tool button to Flush all caches, the browser hangs on a white screen with the message: Redirects to external URLs are not allowed by default, use \Drupal\Core\Routing\TrustedRedirectResponse for it
. The hung URL is /admin/flush?token=wieu87APDL
- This only happens on production, not local
- Clearing cache in
/admin/config/development/performance
works fine