List of steps to reproduce (step by step, including full links if applicable):

• On Czech Wikipedia, navigate to a page with a <mapframe>.
  • E.g. https://cs.wikipedia.org/wiki/Silnice_I/11, https://cs.wikipedia.org/wiki/Silnice_II/611, https://cs.wikipedia.org/wiki/%C5%BDelezni%C4%8Dn%C3%AD_tra%C5%A5_Znojmo%E2%80%93Ok%C5%99%C3%AD%C5%A1ky

What happens?

There is just a complete map of the globe. The element (e.g., road) is not highlighted even after zooming.
There is neither a suspicious message in the JS console under safemode=1 nor a 400+ or 500+ status code.

What should have happened instead?

The map is zoomed to the location of the element and there is an indication of its shape.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:

• Firefox 91.0.2

Silnice I/11	Železniční trať Znojmo–Okříšky

The mapframe is invoked using templates, like Mapframe silnice, with the code:

{{#tag:mapframe|
{
  "properties":{"stroke-width":3,"stroke":"#ff0000"},
  "type":"ExternalData",
  "service":"geoline",
  "ids":"{{{id|{{#invoke:Wikidata|getCurrentId}}}}}"
}
|frameless=1
|width=256
|height=192
|align=center
}}

It's documented on mediawiki.org (but the example there doesn't work anymore either).