Exactly the same happens when you open a text note from Yojimbo with
TextEdit. It’s called “view with TextEdit” for a reason, because any
changes to the document that occur within TextEdit are not saved. It’s
just a preview, you’re not editing the actual document in the
database. I don’t think it makes much sense — when you open a
document, doesn’t matter where it’s stored, you expect to be able to
edit it.