child_instance_type missing in resource definition

[SORC3r3r]

When trying to use the module source = "terraform-alicloud-modules/vpc-peering-multi-region/alicloud", terraform plan tells me that the resource definition is missing the child_instance_type.

╷
│ Error: Missing required argument
│ 
│   on .terraform/modules/vpc_peering.ops-vpc-peering-multi-region/main.tf line 33, in resource "alicloud_cen_instance_attachment" "vpc_attach_1":
│   33: resource "alicloud_cen_instance_attachment" "vpc_attach_1" {
│ 
│ The argument "child_instance_type" is required, but no definition was found.
╵
╷
│ Error: Missing required argument
│ 
│   on .terraform/modules/vpc_peering.ops-vpc-peering-multi-region/main.tf line 40, in resource "alicloud_cen_instance_attachment" "vpc_attach_2":
│   40: resource "alicloud_cen_instance_attachment" "vpc_attach_2" {
│ 
│ The argument "child_instance_type" is required, but no definition was found.