Exception is thrown when saving:
```
Uncaught TypeError: maps.pop(...).remove is not a function
at Link.eval (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:4), <anonymous>:17:25576)
at Function.each (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:5)
at eval (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:4), <anonymous>:17:25544)
at fire (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:45)
at Object.fireWith (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:46)
at Object.fire (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:176)
at VeInitMwDesktopArticleTarget.ve.init.mw.DesktopArticleTarget.replacePageContent (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:4), <anonymous>:1065:659)
at VeInitMwDesktopArticleTarget.ve.init.mw.DesktopArticleTarget.saveComplete (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:4), <anonymous>:1056:630)
at VeInitMwDesktopArticleTarget.ve.init.mw.ArticleTarget.saveSuccess (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:4), <anonymous>:432:530)
at fire (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=1w894nj:45)
```
Causes the save to be interrupted (changes are saved but the editor does not exit - from the user's POV nothing happens when pressing save apart from some dialog animation).
Steps to reproduce:
* go to a page with a map ([[https://www.mediawiki.org/wiki/User:Tgr_(WMF)/test2|test page]])
* edit the page in new wikitext editor (whether the edited section includes the map does not seem to matter)
* save