Error occurs when republishing an existing Landing Page with a fresh database install.

Prereq.:
0. Install eZ Studio 1.3 (1.3.0 or 1.3.1).
1. Update studio-ui-bundle to version 1.3.2-rc1.
2. Reinstall db before test.

Steps:
1. Go to Page (Home Page / Tasteful Planet). [clean / demo]
2. Click Edit on the View-Edit switch.
3. Wait for pre-loader to disappear.
4. Click Publish.
Actual: Publishing is interrupted by error: "The content cannot be published (Connection error : 404.)"
Expected: Another version is published without errors.

Remarks: Problem occurs also on version 1.4.0/1.4.1 but there error is visible only in browser console.