When changing page title in variant this value is rendered only on the variant page itself (either in editor or in preview app) but when browsing other pages the navigation goes back to original title.
MGNLPN-226 should fix the issue but it's still reproducible:
- create a variant of about page in travels demo
- change the page title
- go to preview app and open the about page as visitor meeting the trait condition
- correct title will be shown
- go to any other page
- you'll see the original title in navigation