Right-click dock icon = incomplete list

When I right-click the OO dock icon, I get a context menu that includes a list of recently-opened documents. But there are some documents I keep opening that don’t show up on this list. They do show up in the File/Open Recent menu, but not from right-clicking the dock icon.

All these documents are in the same folder, so location doesn’t seem to be the problem. Is there any reason this is happening? Anything I can do about it? I’d really like to be able to open recent documents from the dock icon.

I’d love to know this too @rogbar, but I suspect the fault may lie in OS X because I have the same gripe with Apple Pages.