S3 client unable to specify ContentType for PutObject

[lilhinx]

Using this code:

let putRequest:PutObjectRequest = .init( body:objectData, bucket:"bucket-name", contentType:"image/jpeg", key:objectKey )

I get a SignatureDoesNotMatch error.

Using this code where I omit the contentType parameter:
let putRequest:PutObjectRequest = .init( body:objectData, bucket:"bucket-name", key:objectKey )

The request succeeds, but the object put into the bucket as a ContentType of application/x-amz-rest-xml

I looked into the underlying code, and I suspect this is due to the Smoke HTTP client adding a header for both the content type supplied by the caller, and the one added by the framework, which seems invalid.