I'm seeing an error about

Your requested instance type (g3.8xlarge) is not supported in your requested Availability Zone (us-east-1a). Please retry your request by not specifying an Availability Zone or choosing us-east-1b, us-east-1c, us-east-1d, us-east-1e.

. I don't understand why Batch is choosing

us-east-1a

even though my compute env has

us-east-1a

and

us-east-1b

subnets available. Is this like a bug in Batch? Does anyone have ideas?