DescribeInstanceTypes does not return VCpuInfo

[r0kas]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone though the API reference
• I've checked AWS Forums and StackOverflow for answers
• I've searched for previous similar issues and didn't find any solution

Describe the bug
When describing an InstanceType like "t3a.large" or "t3a.xlarge" in returned 'InstanceTypeInfo' information about vCPUs is empty - VCpuInfo is nil.

In comparison MemoryInfo is fine and has all the details.

aws-sdk-go v1 does not have this issue and works as expected.

Version of AWS SDK for Go?
v0.29.0

Version of Go (go version)?
v1.15.2

To Reproduce (observed behavior)

reqInput := &ec2.DescribeInstanceTypesInput{
	InstanceTypes: []types.InstanceType{types.InstanceType("t3a.large")},
}

info, err := p.ec2.DescribeInstanceTypes(ctx, reqInput)
if err != nil {
	return nil, fmt.Errorf("describing instance type %q: %v", instanceType, err)
}

fmt.Println(info.InstanceTypes[0].VCpuInfo)

Output: nil

Expected behavior
Expected output:
{
DefaultCores: 1,
DefaultThreadsPerCore: 2,
DefaultVCpus: 2,
ValidCores: [1],
ValidThreadsPerCore: [1,2]
}

Additional context
Tried this out on "t3a.large" and "t3a.xlarge" instance types. Same behavior on both.
aws-sdk-go v1 works as expected.

[skmcgrail]

Thanks for reporting this issue @r0kas, I can confirm this behavior and have narrowed it down to a deserialization bug. We will have this fixed in our next release.

[github-actions]

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