Basic VPC creation failed to sync "CannotUpdateExternalResource" / ReconcileError

[yesteph]

What happened?

Creation of a basic VPC leads to a 'Ready' but 'Synced' = False status.
When I look at the description of my VPC resource in kubernetes, I see a lot of :

Warning  CannotUpdateExternalResource  18m  managed/vpc.ec2.aws.crossplane.io  failed to modify the VPC resource attributes: InvalidParameterCombination: No attributes specified.
           status code: 400, request id: c4fcc49d-c347-43fc-9e36-3b678db0f4d7
  Warning  CannotUpdateExternalResource  18m  managed/vpc.ec2.aws.crossplane.io  failed to modify the VPC resource attributes: InvalidParameterCombination: No attributes specified.
           status code: 400, request id: f01fd688-4f30-44f4-ad44-c3df826ace54
  Warning  CannotUpdateExternalResource  18m  managed/vpc.ec2.aws.crossplane.io  failed to modify the VPC resource attributes: InvalidParameterCombination: No attributes specified.
           status code: 400, request id: c027ed7e-0fda-4f7c-82d3-b25fcdacb835
  Warning  CannotUpdateExternalResource  18m  managed/vpc.ec2.aws.crossplane.io  failed to modify the VPC resource attributes: InvalidParameterCombination: No attributes specified.

How can we reproduce it?

cat <<EOF >> vpc.yaml
apiVersion: ec2.aws.crossplane.io/v1beta1
kind: VPC
metadata:
  name: crossplane-vpc-failed
spec:
  forProvider:
    region: eu-west-3
    cidrBlock: 10.0.0.0/16
EOF
kubectl apply -f vpc.yaml 

What environment did it happen in?

Crossplane version: 1.0.0
AWS Provider version: crossplane/provider-aws:v0.16.0
Kubernetes version: v1.20.0
Environment: minikube on MacOS

Additional information

Empty request to AWS

On the AWS side, I see Crossplane tries to call ec2.ModifyVpcAttribute without specifying any attribute.
The requestParameters only indicates a vpcId, nothing else.

Everything's fine with non-default values

I succeed to create a VPC if I indicate all the optional fields:

cat <<EOF >> vpc-ok.yaml
apiVersion: ec2.aws.crossplane.io/v1beta1
kind: VPC
metadata:
  name: crossplane-vpc-ok
spec:
  forProvider:
    region: eu-west-3
    cidrBlock: 10.0.0.0/16
    enableDnsHostNames: true
    enableDnsSupport: true
    instanceTenancy: default
    tags:
    - key: Name
      value: crossplane-vpc-ok
EOF
kubectl apply -f vpc-ok.yaml