When a page behaves differently from normal, the first place the user checks is the Tools/Page information. It is expected that there will be a "property | yes/no" for all the changes in effect.
On many pages it is written that {{noexternallanglink}} is a magic word https://www.mediawiki.org/w/index.php?search=noexternallanglink
The Page information shows the status for {{defaultsort}} and {{displaytitle}}.
The {{noexternallanglinks}} state may not be shown permanently, but when used in an article it is better to show it in the Page information .
For example, {{noexternallanglinks}} can be in the "Page properties/Magic words" list but without "__" or in the "Basic information" table .