The banner preview functionality on Special:CentralNoticeBanners (when going into edit mode for a banner) does not work for users who do not have centralnotice-admin rights.
There is an error:
Error loading banner preview You are not authorized to preview banners, or your edit token has expired. Please try logging in again or reloading the page.
In fixing T420810, all elements of the Special:CentralNoticeBanners/edit form are disabled for editing if the user does not have centralnotice-admin rights, and we removed the preview section of the page for users who are not allowed to view a preview.
As a follow up, we could allow preview to work for users without centralnotice-admin and then change the page to show the preview section again. Every other part of the form should remain disabled for editing. (view-only)