Yaml !!merge anchors are causing Kustomize errors

[containerpope]

Describe the bug

Till yesterday there was a bug in Kustomize, in case !!merge anchors are used in a certain way in yaml documents.
The fix was merged and released recently in version 4.5.3

kubernetes-sigs/kustomize#4383

https://github.com/kubernetes-sigs/kustomize/releases/tag/kustomize%2Fv4.5.3

Steps to reproduce

Go to knative-eventing repository and deploy their manifest
https://github.com/knative/eventing/releases/download/knative-v1.1.4/eventing-core.yaml

Expected behavior

Everything is deployed nicely, as with kubectl apply.

Screenshots and recordings

OS / Distro

AKS v1.21.9

Flux version

flux: v0.28.2

Flux check

► checking prerequisites
✔ Kubernetes 1.21.9 >=1.20.6-0
► checking controllers
✔ all checks passed

Git provider

Azure DevOps

Container Registry provider

Azure Container Registry

Additional context

Should be simply fixed by updating Kustomize to the newest version

Code of Conduct

• I agree to follow this project's Code of Conduct

[stefanprodan]

This should be fixed in the latest Flux release.