Never mind, this isn't actually a bug with SocialProfile but because Vector removed the "visualClear" CSS class. (T280609)
It can be fixed by adding this to the CSS:

.visualClear { clear: both; }

Never mind, just saw the note on the extension page that it could still be done by transcluding from the /en page instead.

Turns out it was because I hadn't updated the "Thanks" extension to the 1.35 version. It works now, sorry about that.

I was still having the issue after that patch, but I found that it's fixed if you also change

$this->msg( 'ga-back-link', $gift['user_name'] )->escaped() .

in SpecialViewSystemGift.php to this:

In T254705#6204647, @Aklapper wrote:

The same issue occurs on Wikipedia as well.

Can you provide a full link where to see this, and a clear list of steps to reproduce? Thanks!

I tested it on Firefox 77.0.1, Chrome 83.0.4103.97, and Edge 44.18362.449.0.

Thanks for the quick patch, it's fixed now. :)

Thanks for the quick patch. However, I made a test account and it seems to be resolved when AbuseFilter is disabled, but it still shows the same error when it's on.

In T238899#5696820, @Aklapper wrote:

Please provide git hashes instead of dates, as dates can be on any branch and as a date can have more than one commit...

Do you know which month of commits still uses 1.33?

Please install corresponding git branches, e.g. the REL1_33 branches of extensions if you run MediaWiki 1.33. This has nothing to do with dates or with months.

@Jdlrobson I installed the stable releases for both of them from ExtensionDistributor and SkinDistributor since those are what are on both pages right now (those are the Sept 3/Apr 10 versions). I can't install updated versions because they require MW 1.34. Do you know which month of commits still uses 1.33?

Is there any way to add their patch to 1.33.1? I tried manually adding their fix from here: https://gerrit.wikimedia.org/r/#/c/mediawiki/skins/MinervaNeue/+/524588/ but it breaks the table of contents and section collapsing because "currentPageHTMLParser is not a function". Then I tried updating MobileFrontEnd and Minerva to the master versions but they require 1.34.