This is likely what was fixed in z2jh 3.1, see Changelog — Zero to JupyterHub with Kubernetes documentation, linking to How to cleanup orphaned user pods after bug in z2jh 3.0 and KubeSpawner 6.0
This is likely what was fixed in z2jh 3.1, see Changelog — Zero to JupyterHub with Kubernetes documentation, linking to How to cleanup orphaned user pods after bug in z2jh 3.0 and KubeSpawner 6.0