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Found an interesting problem in the CI server #Jenkins yesterday that took me a few hours to figure out, which it should not have.

When creating or updating a job that uses a git credential, Jenkins would show the "unexpected error" page with the following message in journalctl: "The frontend sent an unexpected list of classes".

After digging around on the web, I could not find a solution. I did a fresh install, reconfigure, same error.
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