Workspace Names inconsistent in 'Move to Another Workspace' context Menu

I'm running Mint 17 Qiana MATE 64-bit

I have just used the workspace Switcher Preferences window to create names for my workspaces.

When you right click on an application e.g. Google Chrome in the (Panel/task bar), the Move to Another Workspace context menu lists correctly my 6 workspaces with the names I've just given.

If you right click in the same application's title bar, the Move to Another Workspace context menu instead lists the default names (Workspace 1, Workspace 2... Workspace 6) etc.

I would expect my new workspace names to be available in the title bar context menu, not just the panel.

This isn't isolated to just Chrome, All Application windows seem to be affected. It's reproducible consistently on my machine.

Thanks.