The local module is unable to differentiate between local and remote files. This is causing the translation update process to fail because it is trying to treat the external po files as local. This is causing messages like
"Address (8.x-1.1). File not found at http://ftp.drupal.org/files/translations/8.x/address/address-8.x-1.1.nl.po"
Closed: cannot reproduce
9.5
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
There has been little discussion here an no other reports of this problem. Five years ago steps to reproduce were asked and none has been supplied.
Since there isn't sufficient information here to progress this I am closing this issue.