SignatureDoesNotMatch error on specific chart

[eumel8]

$ helm s3 version
0.10.0
$ helm version
version.BuildInfo{Version:"v3.5.3", GitCommit:"041ce5a2c17a58be0fcd5f5e16fb3e7e95fea622", GitTreeState:"dirty", GoVersion:"go1.15.8"}

helm repo add fairwinds-stable https://charts.fairwinds.com/stable
helm fetch fairwinds-stable/gemini --version 0.0.4
helm s3 push gemini-0.0.4.tgz  my-charts
upload chart to s3: upload object to s3: SignatureDoesNotMatch: The request signature we calculated does not match the signature you provided. Check your key and signing method.
        status code: 403, request id: 000001787A8ED53E44159C169D02DFB2, host id: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSFn189jbxYn409J2SCvNCASwa3KzQys
Error: plugin "s3" exited with error

S3 credentials are okay, I can upload every other charts. After some investigation a trailing whitespace of description in Chart.yaml caused the error. After removing that it works like expected and uploaded the chart without any errors.