activating aws_sdk patching affects Lambda responses sometimes

I use the `aws-sdk-lambda` gem to invoke Lambda functions with the `Aws::Lambda::Client#invoke` method. My functions return JSON strings which then get parsed.

Recently I added X-Ray via the `aws-xray-sdk` gem and found that if I activate the `net_http` and `aws_sdk` patches the response of the Lambda functions sometimes gets scrambled. One or more of the last bytes are appended to the end which leads to a parsing error.
AFAICS this happens to longer responses (around 1K) only but not to short (around 100 bytes) ones. Also when retrying the invocation immediately the response is unscrambled.
When disabling the `aws_sdk` patch this does not seem to happen.