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The ingress-nginx chart defaults the default backend to registry.k8s.io/defaultbackend-amd64, which ships no arm64 build and crash-loops there with "exec format error". Every ingress controller rendered from this package, the host and tenant ingresses and the tenant Kubernetes addon, enables that backend without naming an image. Pin the upstream multi-arch replacement, custom-error-pages, by its index digest. It answers 404 on :8080 and serves /healthz, so the chart's port, probes and restricted securityContext apply unchanged. Assisted-by: LLM Signed-off-by: Aleksei Sviridkin <f@lex.la>