Thanks for reporting. Not sure Growth is the best equipped to fix this but we can look into it. Is this maybe a fallout of rSVEC946bc65ff9b7e07b1acc4831697430ce47df5957 @Jdlrobson?

You can also see it in Monobook https://en.wikipedia.org/wiki/Yang_Guifei?useskin=monobook

This was broken earlier in rMW962ad3329b12

This is what GE is doing:

if ( $this->userHasPersonalToolsPrefEnabled( $user ) ) {
    $links['user-menu']['userpage']['href'] = $this->getPersonalToolsHomepageLinkUrl(
	$skin->getTitle()->getNamespace()
    );
    $links['user-page']['userpage']['href'] = $this->getPersonalToolsHomepageLinkUrl(
	$skin->getTitle()->getNamespace()
    );
   // Make the link blue
   unset( $links['user-menu']['userpage']['link-class'] );
   // Remove the "this page doesn't exist" part of the tooltip
   $links['user-menu']['userpage' ]['exists'] = true;
}

This worked fine before, but the GE extension now needs to be fixed so it doesn’t write to both keys (since it doesn’t know whether both exist and doesn’t check). Writing to a non-existent key creates the duplicate link here.

Change #1230901 had a related patch set uploaded (by Sergio Gimeno; author: Sergio Gimeno):

[mediawiki/extensions/GrowthExperiments@master] fix: avoid displaying incorrect additional userpage link

https://gerrit.wikimedia.org/r/1230901

Change #1230901 merged by jenkins-bot:

[mediawiki/extensions/GrowthExperiments@master] fix: avoid displaying incorrect additional userpage link

https://gerrit.wikimedia.org/r/1230901

Change #1233117 had a related patch set uploaded (by Sergio Gimeno; author: Sergio Gimeno):

[mediawiki/extensions/GrowthExperiments@wmf/1.46.0-wmf.12] fix: avoid displaying incorrect additional userpage link

https://gerrit.wikimedia.org/r/1233117

Change #1233117 merged by jenkins-bot:

[mediawiki/extensions/GrowthExperiments@wmf/1.46.0-wmf.12] fix: avoid displaying incorrect additional userpage link

https://gerrit.wikimedia.org/r/1233117

Mentioned in SAL (#wikimedia-operations) [2026-01-26T14:32:27Z] <sgimeno@deploy2002> Started scap sync-world: Backport for [[gerrit:1233116|fix: avoid logging traffic from overridden experiment users (T415294)]], [[gerrit:1233117|fix: avoid displaying incorrect additional userpage link (T415291)]]

Mentioned in SAL (#wikimedia-operations) [2026-01-26T14:34:34Z] <sgimeno@deploy2002> sgimeno: Backport for [[gerrit:1233116|fix: avoid logging traffic from overridden experiment users (T415294)]], [[gerrit:1233117|fix: avoid displaying incorrect additional userpage link (T415291)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Mentioned in SAL (#wikimedia-operations) [2026-01-26T14:39:21Z] <sgimeno@deploy2002> Finished scap sync-world: Backport for [[gerrit:1233116|fix: avoid logging traffic from overridden experiment users (T415294)]], [[gerrit:1233117|fix: avoid displaying incorrect additional userpage link (T415291)]] (duration: 06m 54s)