Thread:Project:Support desk/Uploads not working in 1.20.1

I upgraded from 1.19.2 to 1.20.1 and am having an issue with uploads. A few scenarios:

1. I have a wanted file, and so I click on it which redirects me to the upload page. I can upload the file, and the file is clearly in the wiki. However, links to the file do not work.

2. I try to re-upload the file, and MediaWiki correctly tells me that the file exists. I choose to Ignore Warnings and get an Internal Error:

Internal error key '111qvbp6y0yk.1yyrqh.1.pdf' not found in stash Backtrace:
 * 1) 0 /home/site/includes/upload/UploadStash.php(159): UploadStash->getFile('111qvbp6y0yk.1y...')
 * 2) 1 /home/site/includes/upload/UploadFromStash.php(99): UploadStash->getMetadata('111qvbp6y0yk.1y...')
 * 3) 2 /home/site/includes/upload/UploadFromStash.php(122): UploadFromStash->initialize('111qvbp6y0yk.1y...', 'MFE_MT_Week_6_A...')
 * 4) 3 /home/site/includes/upload/UploadBase.php(166): UploadFromStash->initializeFromRequest(Object(WebRequest))
 * 5) 4 /home/site/includes/specials/SpecialUpload.php(86): UploadBase::createFromRequest(Object(WebRequest))
 * 6) 5 /home/site/includes/specials/SpecialUpload.php(159): SpecialUpload->loadRequest
 * 7) 6 /home/site/includes/SpecialPage.php(611): SpecialUpload->execute(NULL)
 * 8) 7 /home/site/includes/SpecialPageFactory.php(494): SpecialPage->run(NULL)
 * 9) 8 /home/site/includes/Wiki.php(290): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
 * 10) 9 /home/site/includes/Wiki.php(536): MediaWiki->performRequest
 * 11) 10 /home/site/includes/Wiki.php(446): MediaWiki->main
 * 12) 11 /home/site/index.php(59): MediaWiki->run
 * 13) 12 {main}

I couldn't find any reference to this - any help would be greatly appreciated.