New writing room interface feedback. Can the legacy editor be made a permanent option?

We've been opted out of of the new editor for a while now but today it seems to have been forced on us again without warning. Is this intentional? is there a way to revert back again? It still has so many issues as to be unusable for us and our workflows.

For us the biggest blocker is that it seems impossible to actually find content to link to. The search when linking to other documents seems to be missing almost all results that show up in the legacy editor just fine.

The issues seems particularly bad when editing content inside of a release, in this situation only a very small amount of the total available content seems to show up in search results when linking. We use document links a lot and this means the new editor is completely un-usable for us for many changes.

To try and illustrate the point I have included screenshots of trying to add a link to the same document from the "published" version which shows lots of potential options (but weirdly not all) and on the "Next" release which shows only a single (seemingly random, which one exactly) "collection" document. Any further searches for documents of the "collection" type that I know 100% exists in both releases return zero results.

Is this user-error on our part or is it fundamentally broken?