Before this new "improved" Confluence, I could create a link to not-yet-exiting page on the fly, and create that page after I had finished editing the parent page. This technique is called 'Representational state transfer' (REST) -> one can statelessly link to a resource whose existence (=state) is not known.
How do I do that now? Confluence editor only gives me a drop-down list of existing pages and does not accept a new link text instead. If I try writing a new link and press enter, the editor just discards the changes and no link is created.