existing-resource-policy doesn't work

[mzimry]

What steps did you take and what happened:

when creating a restore using --existing-resource-policy update . the restore doesn't update existing resources. getting this in the restore description: could not restore, Secret "xxx" already exists. Warning: the in-cluster version is different than the backed-up version.

when checking restore details i can see that this configuration is not set: Existing Resource Policy: <none>

What did you expect to happen: update existing resources. The following information will help us better understand what's going on:

If you are using velero v1.7.0+:
Please use velero debug --backup <backupname> --restore <restorename> to generate the support bundle, and attach to this issue, more options please refer to velero debug --help

If you are using earlier versions:
Please provide the output of the following commands (Pasting long output into a GitHub gist or other pastebin is fine.)

• kubectl logs deployment/velero -n velero
• velero backup describe <backupname> or kubectl get backup/<backupname> -n velero -o yaml
• velero backup logs <backupname>
• velero restore describe <restorename> or kubectl get restore/<restorename> -n velero -o yaml
• velero restore logs <restorename>

Anything else you would like to add:

Environment:

• Velero version (use velero version): v.13.1

• Velero features (use velero client config get features): features: <NOT SET>

• Kubernetes version (use kubectl version):

• Client Version: v1.29.2 Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3 Server Version: v1.29.7

• Kubernetes installer & version:

• Cloud provider or hardware configuration: GCP

• OS (e.g. from /etc/os-release): mac os

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