Jenkins GitHub plugin can't choose my credentials
<p>I got very strange behavior that has never happened before, when I try to configure the GitHub server in Jenkins general configuration to set up webhooks auto.</p>

<p>The drop down menu doesn't display my registered credentials. I was always be able to do that, but suddenly I don't know what's happening. I tried to uninstall the plugin, restarting Jenkins, kill the Jenkins Docker container and configure all the stuff again ... still I got the same issue.</p>

<p><a href="https://i.stack.imgur.com/KPbP1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KPbP1.png" alt="Enter image description here"></a></p>

<p>There is no other option other than none, and when I add new credentials I still get <em>None</em> as the only option...</p>