Since a few days ago, mapframe dynamic maps don't reliably work.
On the page ru:Пизанская башня I get the error
Failed to load resource: the server responded with a status of 400 ()
The resource in question is https://maps.wikimedia.org/geoline?getgeojson=1&ids=Q39054 and it returns
"headers is not defined"
An other kind of error is on fr:Foire de Liège:
load.php?debug=false&lang=fr&modules=jquery|mediawiki.page.gallery&skin=vector&version=03l1ewh:51 jQuery.Deferred exception: Cannot set property 'dataGroup' of undefined TypeError: Cannot set property 'dataGroup' of undefined at ExternalGroup.<anonymous> (<anonymous>:29:929) at Function.each (https://fr.wikipedia.org/w/load.php?debug=false&lang=fr&modules=jquery%7Cmediawiki.page.gallery&skin=vector&version=03l1ewh:4:868) at <anonymous>:29:656 at mightThrow (https://fr.wikipedia.org/w/load.php?debug=false&lang=fr&modules=jquery%7Cmediawiki.page.gallery&skin=vector&version=03l1ewh:48:856) at process (https://fr.wikipedia.org/w/load.php?debug=false&lang=fr&modules=jquery%7Cmediawiki.page.gallery&skin=vector&version=03l1ewh:49:516) undefined
These errors are temporary because now a few minutes later both work again.