The custom mutation handler failed to process the deletion request of CR

[iiiceoo]

Version

• controller-runtime: v0.13.0
• Kubernetes: 1.23.4

Reproduce

1. Enable CRD deletion mutation in MutatingWebhookConfiguration.
2. Execute kubectl delete <CRD> <CR>, and get error message "there is no content to decode".

Reference

#1762
#1765

[iiiceoo]

I encountered the same problem as in #1762. When I delete the CR, the error "there is no content to decode" is returned from the mutating webhook.

The only difference is that I registered webhook for CR in the following way:

return ctrl.NewWebhookManagedBy(sm.runtimeMgr).
	For(&xxx.CR{}).
	WithDefaulter(sm).
	WithValidator(sm).
	Complete()

Then I found that the bug was only solved in the handler of interface Defaulter, but not in interface CustomDefaulter.