Created attachment 104162 [details]
If this document is opened in LO 4.0, it will only show ONE number in the even page footer.   If this document is opened in LO 4.2, it will show TWO numbers/frames in the even page footer.

LibreOffice creates a NEW frame upon loading a document that has a text frame in the header or footer of a page with different odd & even pages. The text frame of an odd-page footer is duplicated and added to the even page footer.


Steps to re-create the problem.
1) on a two+ page document, format page - turn on footer, uncheck (turn off) same content left/right
2.) Insert Frame into the footer on the first (odd number) page.  Give the frame a name so that you can identify it in View-Navigator-TextFrames.
3.) save and close.  Upon reopening the document, you will see a second Frame has been automatically created, and displays on the second (even number) page footer.


Notes:
-the same is true for headers
-not a bug in 4.0.  Bug is present in 4.2.  Likely first broken in 4.0.5 or 4.0.6.