R2: upload failed

Since March 9 I have been getting this error while uploading large (>100Gi) files to R2:

An error occurred (InternalError) when calling the UploadPart operation (reached max retries: 2): We encountered an internal error. Please try again.

I am piping from stdin to aws s3 cli with the following command:

<piped file> | aws s3 cp --expected-size=200000000000 - --endpoint-url <redacted> s3://<redacted>

It was always fine before, and now it’s always failing. Any insight please?