Changing priority for Sub Item fails with 500 exception.
Steps to reproduce
1. Clean installation of eZ Platform 2.4 with Legacy Bridge
2. Inside tree root create a new Folder A (in legacy backoffice).
3. In Folder A create a new Folder B.
4. Change priority for Folder B.
5. Check response in Dev Tools.
HTTP 500 Internal Server Error
Missing form token from Request