The deployment failed because a non-empty field was discovered on your Auto Scaling group that Code Deploy does not currently support copying

We are, as of an hour ago, getting the following error on all of out environments (multiple AWS accounts). Everything was working fine 6 hours ago. No changes to configuration of CodeDeploy or Autoscaling Groups have been made today.

The deployment failed because a non-empty field was discovered on your Auto Scaling group that Code Deploy does not currently support copying. Unsupported fields: [DescribeAutoScalingGroupsResponse.DescribeAutoScalingGroupsResult.AutoScalingGroups.member.TrafficSources.member.Type]

Are there any issues here that AWS are aware of? If not how to I see that the value of the variable is?