Since drafts use a different system for triaging, we should not remove drafts from Special:NewPagesFeed if PageTriage considers them "reviewed" (as this typically means someone just clicked on the patrol link). Instead, Special:NewPagesFeed should allow access to all drafts until they are deleted or published to main namespace.
This should be possible by simply adding showreviewed=1 to the API queries that Special:NewPagesFeed sends for requesting lists of drafts.