Running the latest docker image with the plugin update script produces:

Installed plugins:
ansible:1.0
ansicolor:0.6.3
warning [/usr/share/jenkins/ref/plugins/configuration-as-code.jpi]:  1310038 extra bytes at beginning or within zipfile
  (attempting to process anyway)
error [/usr/share/jenkins/ref/plugins/configuration-as-code.jpi]:  start of central directory not found;
  zipfile corrupt.
  (please check that you have transferred or created the zipfile in the
  appropriate BINARY mode and that you have compiled UnZip properly)

When manually checking the mirror at https://updates.jenkins.io/download/plugins/configuration-as-code/ version 1.40 is 2.8MB in size while all previous versions are <1.6MB. This seems to be a huge jump in code size and this affects many other plugins all of which fail installing - even from the UI. A couple more examples are:

• BlueOcean is another such plugin with a size change of 68.0KB to 122KB.
• BlueOcean-web is another such plugin with a size change from 1.3 to 2.4MB.