Steps to replicate the issue (include links if applicable):
What happens?:
The page hangs in a "loading" state. There's an error message in browser console:
Cannot read properties of null (reading 'impact') at initializeModule (load.php?lang=pl&modules=%40wikimedia%2Fcodex%2Ccodex-styles%2Cjquery%2Cmoment%2Coojs-ui-core%2Cvue%7Cext.growthExperiments.Homepage.NewImpact%7Cext.wikimediaEvents.specialPages%7Cjquery.ui&skin=vector-2022&version=15uii:658:629) at load.php?lang=pl&modules=%40wikimedia%2Fcodex%2Ccodex-styles%2Cjquery%2Cmoment%2Coojs-ui-core%2Cvue%7Cext.growthExperiments.Homepage.NewImpact%7Cext.wikimediaEvents.specialPages%7Cjquery.ui&skin=vector-2022&version=15uii:659:192
(the same happens with ?debug=2 flag in the URL)
What should have happened instead?:
The page should render properly, like it does on Special:Homepage
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):