It seems (according to CentralAuth) that that specific rename has been completed, but the issue with the GlobalRenameProgress page remains.
[0f42ef75669d91261d07550c] /wiki/index.php/Special:GlobalRenameProgress?username=A&redirectparams= LogicException from line 1489 of /var/www/html/wiki/includes/htmlform/HTMLForm.php: HTMLForm::displaySection() called on uninitialized field data. You probably called displayForm() without calling prepareForm() first.
The patch was merged on May 5th. I'm not aware of a SWAT deployment (backporting to 1.27).
Hence the fix should be included in 1.28.0-wmf.1 which is not deployed on all wikis yet: https://www.mediawiki.org/wiki/MediaWiki_1.28/Roadmap
Confirmed, this task appears to be resolved - the fix may not have been applied to $favouritewiki yet - that depends on the wiki's updating process which is separate to MediaWiki development