The prolific traffic leaks on CB WLs are as old and well-documented as Sober's love of poo. Nothing new to see here.
Punker has explained numerous times that CB cookies are not overwritten when a surfer clicks one of those links.
While I agree it's confusing for the surfer, and *should* be fixed/filtered as you suggested... I can almost guarantee you that nothing will be done about it. WLs are not their priority.
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