Hello.
Confluence server sits behind proxy.
First base_url was configured ti server ip address.
Then we changed base_url to domain address.
After this when inserting link to a page created before base_url change after saving open the link in page edit mode. Back in source page edit link edit is greyed out.
During insert the link shows as view page.
If after inserting such a link save the destination page - it opens in view mode.
As well if linking to hte page created after base_url change - everything works fine.