Steps:
1. open a PDF normally, and edit it, such as by adding text or inserting pages
2. without saving or closing the open PDF, go to Finder, right-click and press command-P to print the PDF
3. the print window appears, with all of the in-progress edits
4. click "Cancel" and the PDF is closed, without saving the changes and without a warning about unsaved changes.

When printing a PDF from Finder, Acrobat should check whether the file was already open, and not close it if it was. If it does close the file, it should check to see if it has changed, and give the usual warning.