Note there is also a mismatch between the icon used for temp accounts on userinfo versus the one used on mobile:

One idea is to remove the user icon from MinervaNeue

.mw-userlink::before {
	content: '';
	.cdx-mixin-css-icon( @cdx-icon-user-avatar, @color-subtle );
	margin-right: 8px;
}

Change #1172902 had a related patch set uploaded (by Kosta Harlan; author: Kosta Harlan):

[mediawiki/extensions/CheckUser@master] UserInfoCard: Hide MinervaNeue avatar on .mw-userlink

https://gerrit.wikimedia.org/r/1172902

The patch fixing this issue is being merged right now, so moving the ticket forward for QA.

Change #1172902 merged by jenkins-bot:

[mediawiki/extensions/CheckUser@master] UserInfoCard: Hide MinervaNeue avatar on .mw-userlink for diffs and history

https://gerrit.wikimedia.org/r/1172902

I am still seeing duplicate UserInfoCard icons for the same user especially when I view the WatchList page.
Since Kosta is out of office this week I am pushing this back to Ready so another engineer can take a look at it.

Change #1177973 had a related patch set uploaded (by Mszwarc; author: Mszwarc):

[mediawiki/extensions/CheckUser@master] UserInfoCard: Hide Minerva's avatar on Special:Watchlist

https://gerrit.wikimedia.org/r/1177973

Change #1178470 had a related patch set uploaded (by Mszwarc; author: Mszwarc):

[mediawiki/skins/MinervaNeue@master] Special:Watchlist: Fix layout of log entries around userlinks

https://gerrit.wikimedia.org/r/1178470

Change #1177973 merged by jenkins-bot:

[mediawiki/extensions/CheckUser@master] UserInfoCard: Hide Minerva's avatar on Special:Watchlist

https://gerrit.wikimedia.org/r/1177973

Change #1178470 merged by jenkins-bot:

[mediawiki/skins/MinervaNeue@master] Special:Watchlist: Fix layout of log entries around userlinks

https://gerrit.wikimedia.org/r/1178470

I don't see duplicate icons in diffs directly anymore, but it still appears in info cards:

In T398392#11082274, @Escargot_rouge wrote:

I don't see duplicate icons in diffs directly anymore, but it still appears in info cards:

Can you provide the exact URL you used to get this? Also we have made some changes which may affect this and should be deployed there today.

It's any diff, for example https://en.m.wikipedia.org/w/index.php?title=Draft:Typhoon_Podul_(2025)&curid=80691989&diff=1305855111&oldid=1305855040. If you are accessing it from a desktop, you must reduce the window width until the bottom card appears, and then click on the icon (the issue is otherwise not visible).

Thanks. I am able to reproduce it on my local wiki:

I think we should create a new ticket for this specific issue. @mszwarc would you agree?

In T398392#11086631, @Dreamy_Jazz wrote:

Thanks. I am able to reproduce it on my local wiki:

I think we should create a new ticket for this specific issue. @mszwarc would you agree?

Yes, let's do so; let's not dilute this task even more with new patches and things to review.

New Code Changes have been implemented, and verified per the Acceptance Criteria:
QA was completed for this ticket using LocalHost: Mediawiki1.45.0-alpha / CheckUser 2.5 (e561217).
Testing was performed on various: Skins, Desktop View/MobileView, Chrome/Edge/Firefox/Safari, Windows/Mac/Android/iOS, RTL languages

@Escargot_rouge @Dreamy_Jazz @mszwarc Captured it here: T403417: UserInfo: Duplicate icon shown on mobile view