STEPS TO REPRODUCE
- Login as Admin
- Go to http://localhost:8080/xwiki/bin/view/Panels/
- Observe the placeholder text under 'Create a new Panel' section
- Click on the field and type a name
The default placeholder text is 'Panel Title'. When the user starts typing, the text disappears.
The placeholder text appears not to be grayed out, but solid, as if it's pre-filled. When the user starts typing a name, it doesn't disappear anymore, it has to be deleted manually.
The issue could not be reproduced on XWiki 12.1.