Yeah that's what I was doing :)
It looks like the problem is that the "Title for search engines" (when filled in with a resource name) blocks saving of the page
So for example the Newsletter Overview page if you edit it, this is the name in there
...trying to save generates this
The 'Title for search engines' contains invalid symbols.
So clearly no search engine will be indexing my backend, so if I remove that text I instead get this
The 'Title for search engines' contains invalid symbols. Title for search engines cannot be empty.
...so since it needs something, and will never be indexed by google it'd be safe to just enter ANYTHING in there, and I can...but it's blocking user input really if someone didn't know that.