Push successful but logged an error

[JeyJeyGao]

What is not working as expected?

$ notation sign --key  wabbit-networks-ca-issued $image -v
INFO Using the referrers tag schema
INFO Reference v1 resolved to manifest descriptor: {MediaType:application/vnd.docker.distribution.manifest.v2+json Digest:sha256:43837354f3f9a79b20b430b8ce4b6cc43c52dbabed9e88775b53697fe560c329 Size:1782 URLs:[] Annotations:map[] Data:[] Platform:<nil> ArtifactType:}
Warning: Always sign the artifact using digest(@sha256:...) rather than a tag(:v1) because tags are mutable and a tag reference can point to a different artifact than the one signed.
ERRO Failed to push the signature
Warning: Removal of outdated referrers index from remote registry failed. Garbage collection may be required.
Successfully signed wabbitregistry.azurecr.io/net-monitor@sha256:43837354f3f9a79b20b430b8ce4b6cc43c52dbabed9e88775b53697fe560c329

ERRO Failed to push the signature
......
Successfully signed

Which is confusing.

What did you expect to happen?

For this case:
Warning: Removal of outdated referrers index from remote registry failed. Garbage collection may be required.

We should not log an error.

How can we reproduce it?

re-sign an artifact in a registry that doesn't support deleting blob with digest

Describe your environment

Linux

What is the version of your notation-go Library?

1.1.0