I think, it is not "problem" of Zotero. Zotero only adds to the text of the document formatted citation or bibliography on the position you specify. The MS Word or LibreOffice manage the position of endnotes.

Yes, but the Zotero plugin evidently blocked the "add page" feature to add a new section page after the endnotes. I had always been able to do this before I got zotero, but even changing the notes to "end of section" would not allow me to insert an additional page afterward. If there is something I'm missing, I'm all ears.

But it still formats a works cited after that as if it were end notes as well.

My workaround ended up being to unlink all citations, save it as a PDF, copy each section individually (body text, end notes and bibliography) and paste them into a new word document, and go through the text and fix the formatting and return issues that inevitably happen when copying and pasting across formats. It was very time-consuming and it seems like it would be a fairly simple fix to include the option to add a bibliography after end notes, since that is typically where one would go anyway. Or ANY other regularly formatted pages, because if I write a book where the end notes are after each individual chapter, I basically can't use zotero because of this and still have it be in the same file.