When builds are triggeres manually by the "Build Now" button, then an agent will be created, but the builds are not processed. I just get:

Started by user myuser
Running as myuser
Obtained Jenkinsfile from 95690226dba08354f99f1ef4adb30cf01fddee6d
Running in Durability level: MAX_SURVIVABILITY
[Pipeline] Start of Pipeline
[Pipeline] readTrusted
Obtained build/jenkins/pod.yaml from 95690226dba08354f99f1ef4adb30cf01fddee6d
[Pipeline] podTemplate
[Pipeline] {
[Pipeline] node
Still waiting to schedule task
‘dr.how-jenkins-image-develop-7-90t6s-plm5r-kt00q’ is offline

If the build was triggered by a webhook, everything works as expected.

The kubernetes plugin is configured as followed:

• Name: Kubernetes
• Kubernetes URL: https://kubernetes.default.svc.cluster.local
• Jenkins URL: http://jenkins.jenkins.svc.cluster.local:8080
• Jenkins: Tunnel: jenkins.jenkins.svc.cluster.local:50000
• Pod Retention: Never
• Max connections to Kubernetes API: 0
• Seconds to wait for pod to be running: 600