The "page" input selector (#mw-whatlinkshere-target or #mw-target-user-or-ip) automatically opens and doesn't dismiss in the latest update, persistently blocking links and other content behind it. Skin-agnostic.
WLH: Compare https://test.wikipedia.org/wiki/Special:WhatLinksHere/Main_Page?safemode=1 (group 0) and https://fr.wiktionary.org/wiki/Special:WhatLinksHere/Main_Page?safemode=1 (group 1) (both wmf.7) to https://zh.wikipedia.org/wiki/Special:WhatLinksHere/Main_Page?safemode=1 (group 2, wmf.6).
Contribs: Compare https://test.wikipedia.org/wiki/Special:Contributions/Jimbo_Wales?safemode=1 (group 0) and https://fr.wiktionary.org/wiki/Special:Contributions/Jimbo_Wales?safemode=1 (group 1) (both wmf.7) to https://zh.wikipedia.org/wiki/Special:Contributions/Jimbo_Wales?safemode=1 (group 2, wmf.6).