All pages using this templates (in generally all extension pages) the field "Latest preview version" is visible all the time, even if the field isn't filled or included in the template inclusion. This seems to be after one of the edits from @Paladox2017:. I suggest, that @Paladox2017: looks at his edits and see, if he can find the problem (i'm not a template specialist and wont changhe something in this very often used template :)). Otherwise i will rollback to a working version of @Jdforrester (WMF):.
Problem probably caused by change or later. Thanks for fixing!