it appears Ticket #5278 is occurring on new collection page types
I've installed 2.4.0 by removing the cms and sapphire directories and copying the new ones in.
When creating a new standard page, and adding a link the Ticket #5278 is indeed closed/fixed.
But when creating a new Collection Page and adding a link to the content block on the "Main" tab - I think this ticket shouldn't be closed or a new one opened?
I can't tell where the error lies because the Collection Page just extends Page so surely a fix to Page would carry through?