I have the Jenkins installed on a K8s cluster and I have the same cluster configured as a cloud within Jenkins. The default pod template is configured in the UI (no additional container templates). I'm using declarative pipelines in a Jenkinsfile in my project repo. 

However, when I try to add a container template using inheritance(within the declarative pipeline) to the default pod template its stuck on finding an executor. 

Details and code samples documented in SO
Adding container templates via yaml in declarative pipelines for k8s agents on jenkins - Stack Overflow 

Idk if this is a bug, the doc has a similar example (it overrides something that is already in the UI pod template, I wish to merge and add a new container template). I appreciate all the insight