This was previously reported on T331679. There have been some changes to how user and site scripts load for Vector 2022 on certain wikis. Gadgets are not impacted. If you think you have been impacted or want to minimize impact to your project please see this ticket.
Wikis impacted:
* All projects where Vector legacy is the default skin
* Wikivoyage
* Wikibooks
All projects will be impacted over the next 3 months. It is strongly advised that you coordinate and take action proactively rather than retroactively :)
# Proactive actions required to avoid disruption
* Copy essential code in [[MediaWiki:Vector.js]] to [[MediaWiki:Vector-2022.js]]. Note temporarily this will load both sets of code so make sure that your code is setup defensively e.g. for example to avoid two identical buttons being added to a page.
* Copy essential code in [[MediaWiki:Vector.css]] to [[MediaWiki:Vector-2022.css]]
* Copy essential code in [[Special:MyPage/vector.js]] to [[Special:MyPage/vector-2022.js]]
* Copy essential code in [[Special:MyPage/vector.css]] to [[Special:MyPage/vector-2022.css]]
* Request to be fast tracked by commenting on this ticket.
# Retroactive actions required to restore old behaviour.
* Copy essential code in [[MediaWiki:Vector.js]] to [[MediaWiki:Vector-2022.js]]
* Copy essential code in [[MediaWiki:Vector.css]] to [[MediaWiki:Vector-2022.css]]
* Copy essential code in [[Special:MyPage/vector.js]] to [[Special:MyPage/vector-2022.js]]
* Copy essential code in [[Special:MyPage/vector.css]] to [[Special:MyPage/vector-2022.css]]