Resource dispatcher might fail on `remove` hook

[dariofaccin]

Bug Description

As subject.

To Reproduce

1. juju deploy resource-dispatcher
2. Integrate with required charms
3. juju remove-application resource-dispatcher

Environment

Any

Relevant Log Output

2026-09-02T08:59:31.372Z [container-agent] 2026-09-02 08:59:31 INFO juju.worker.uniter.operation runhook.go:186 ran "stop" hook (via hook dispatching script: dispatch)
2026-09-02T08:59:31.868Z [container-agent] 2026-09-02 08:59:31 WARNING juju-log The ``kubernetes_service_patch v1`` library is DEPRECATED and will be removed in October 2025. For patching the Kubernetes service created by Juju during the deployment of a charm, ``ops.Unit.set_ports`` functionality should be used instead.
2026-09-02T08:59:31.960Z [container-agent] 2026-09-02 08:59:31 INFO juju-log HTTP Request: GET https://10.152.183.1/apis/security.istio.io/v1/authorizationpolicies?labelSelector=app.kubernetes.io%2Finstance%3Dresource-dispatcher-kubeflow%2Ckubernetes-resource-handler-scope%3Dresource-dispatcher-allow-all "HTTP/1.1 200 OK"
2026-09-02T08:59:32.048Z [container-agent] 2026-09-02 08:59:32 INFO juju-log HTTP Request: GET https://10.152.183.1/apis/apiextensions.k8s.io/v1/customresourcedefinitions "HTTP/1.1 200 OK"
2026-09-02T08:59:32.332Z [pebble] Check "readiness" failure 1/3: non-2xx status code 418
2026-09-02T08:59:32.353Z [container-agent] 2026-09-02 08:59:32 INFO juju-log Rendering manifests
2026-09-02T08:59:32.392Z [container-agent] 2026-09-02 08:59:32 ERROR juju-log Uncaught exception while in charm code:
2026-09-02T08:59:32.392Z [container-agent] Traceback (most recent call last):
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/src/charm.py", line 396, in <module>
2026-09-02T08:59:32.392Z [container-agent]     main(ResourceDispatcherOperator)
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/__init__.py", line 356, in __call__
2026-09-02T08:59:32.392Z [container-agent]     return _main.main(charm_class=charm_class, use_juju_for_storage=use_juju_for_storage)
2026-09-02T08:59:32.392Z [container-agent]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/_main.py", line 502, in main
2026-09-02T08:59:32.392Z [container-agent]     manager.run()
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/_main.py", line 486, in run
2026-09-02T08:59:32.392Z [container-agent]     self._emit()
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/_main.py", line 421, in _emit
2026-09-02T08:59:32.392Z [container-agent]     self._emit_charm_event(self.dispatcher.event_name)
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/_main.py", line 465, in _emit_charm_event
2026-09-02T08:59:32.392Z [container-agent]     event_to_emit.emit(*args, **kwargs)
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/framework.py", line 351, in emit
2026-09-02T08:59:32.392Z [container-agent]     framework._emit(event)
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/framework.py", line 924, in _emit
2026-09-02T08:59:32.392Z [container-agent]     self._reemit(event_path)
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/ops/framework.py", line 1030, in _reemit
2026-09-02T08:59:32.392Z [container-agent]     custom_handler(event)
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/src/charm.py", line 385, in _on_remove
2026-09-02T08:59:32.392Z [container-agent]     k8s_resources_manifests = self.k8s_resource_handler.render_manifests()
2026-09-02T08:59:32.392Z [container-agent]                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/charmed_kubeflow_chisme/kubernetes/_kubernetes_resource_handler.py", line 268, in render_manifests
2026-09-02T08:59:32.392Z [container-agent]     self._manifests = codecs.load_all_yaml(
2026-09-02T08:59:32.392Z [container-agent]                       ^^^^^^^^^^^^^^^^^^^^^
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/lightkube/codecs.py", line 96, in load_all_yaml
2026-09-02T08:59:32.392Z [container-agent]     return _flatten(yaml.safe_load_all(stream))
2026-09-02T08:59:32.392Z [container-agent]            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/lightkube/codecs.py", line 86, in _flatten
2026-09-02T08:59:32.392Z [container-agent]     res = from_dict(obj)
2026-09-02T08:59:32.392Z [container-agent]           ^^^^^^^^^^^^^^
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/lightkube/codecs.py", line 44, in from_dict
2026-09-02T08:59:32.392Z [container-agent]     model = resource_registry.load(d["apiVersion"], d["kind"])
2026-09-02T08:59:32.392Z [container-agent]             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-09-02T08:59:32.392Z [container-agent]   File "/var/lib/juju/agents/unit-resource-dispatcher-0/charm/venv/lib/python3.12/site-packages/lightkube/core/resource_registry.py", line 114, in load
2026-09-02T08:59:32.392Z [container-agent]     raise LoadResourceError(
2026-09-02T08:59:32.392Z [container-agent] lightkube.core.exceptions.LoadResourceError: Cannot find resource DecoratorController of group metacontroller.k8s.io/v1alpha1. If using a CRD, ensure a generic resource is defined.
2026-09-02T08:59:32.697Z [container-agent] 2026-09-02 08:59:32 ERROR juju.worker.uniter.operation runhook.go:180 hook "remove" (via hook dispatching script: dispatch) failed: exit status 1

Additional Context

No response