I am getting CORS errors in S3 console, is this a bug with AWS S3?

I don't have an account to fill out a tech support ticket, but this isn't tech support. It feels like a bug:

Access to XMLHttpRequest at 'https://us-east-1.console.aws.amazon.com/s3/proxy' from origin 'https://s3.console.aws.amazon.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

A lot of these errors for all of my buckets. On the main list of buckets I am getting all 400 responses from the Access column for all buckets. It shows 'Unknown Error':

Request URL: https://us-east-1.console.aws.amazon.com/s3/s3control-proxy
Request Method: POST
Status Code: 400 
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