When trying to rename new navigation nodes to the 'Navigation' tree in the WCMS, changing the existing 'Name' field value causes the attached error and blocks any further menu/navigation editing capabilities for the rest of the session and I faced the same issue on latest version of hybris 5.7.0.4 which recreating the same in electronic site.
please check the screenshot
[1]: /storage/temp/4862-redraw-issue.png