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See https://phabricator.wikimedia.org/T54469

Some anchors in MediaWiki's 'Special:Preferences' page are not accessible.

For instance, going to https://fr.wiktionary.org/wiki/Spécial:Préférences#mw-htmlform-signature, the link will work, because it's an anchor for the preselected tab; whereas going to https://fr.wiktionary.org/wiki/Spécial:Préférences#mw-input-wpgadgets-DeluxeHistory won't work because the anchor doesn't link to a section of a tab selected by default.

This might be fixed with JavaScript looking for that ID and, if it's on a hidden tab, switch to that tab and then navigate to it.