These need to be adjusted to the new structure, hopefully in a forwards and backwards compatible way.
Some places to go looking include,
* Special:GadgetUsage
* mwgrep on wikis in the javascript namespace.
* https://usage.toolforge.org/
* https://en.wikipedia.org/wiki/Wikipedia:User_scripts
See the notes at https://www.mediawiki.org/wiki/Parsing/Media_structure#Migrating_Gadgets_and_User_Scripts
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From T314318#8216188, the gadget "Direct imagelinks to Commons" was identified as needing the following update,
https://www.mediawiki.org/w/index.php?title=Snippets%2FDirect_imagelinks_to_Commons&type=revision&diff=5451422&oldid=3976429
The list of wikis that have it enabled is: P896, and user scripts: P34191
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From T297447#8243317, the gadget "WikiMiniAtlas" was identified as needing the following update,
https://meta.wikimedia.org/w/index.php?title=MediaWiki%3AWikiminiatlas.js&type=revision&diff=23833370&oldid=22661610
The list of wikis that have it enabled is: P38164
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From T297447#8330857, the gadget "WikimediaUI Dark Mode" was identified as needing the following update,
https://en.wikipedia.org/w/index.php?title=MediaWiki%3AGadget-dark-mode.css&type=revision&diff=1119248845&oldid=1101625928
The list of wikis that have it enabled is: P38165