Seen on 1.37.0-wmf.6, currently at group0:
https://www.mediawiki.org/wiki/Template:MediaWiki_PHP_7.4.0_to_7.4.2?safemode=on
Still fine on en.wikipedia.org and test2.wikipedia.org (1.37.0-wmf.5),
e.g. https://test2.wikipedia.org/wiki/Main_Page