Security groups not used when security group passed to a module

[srouaix]

We develop some modules and we have a module to create alb. We pass the id of security group to the module to be used inside. example :

module "alb" {
  source = "../.."
  security_groups        = [aws_security_group.main.id]
}

we receive the following error

Security Group Not Used, Severity: INFO, Results: 3
Description: Security group must be used or not declared
Platform: Terraform
Learn more about this vulnerability: https://docs.kics.io/latest/queries/terraform-queries/aws/4849211b-ac39-479e-ae78-5694d506cb24
	[1]: examples/nlb-with-tg/requirements.tf:1
		001: resource "aws_security_group" "main" {
		002:   name        = local.name
		003:   description = "${local.name} NLB"
	[2]: examples/alb-with-tg/requirements.tf:1
		001: resource "aws_security_group" "main" {
		002:   name        = local.name
		003:   description = "${local.name} ALB"
	[3]: examples/alb-without-tg/requirements.tf:1
		001: resource "aws_security_group" "main" {
		002:   name        = local.name
		003:   description = "${local.name} ALB"

Do you know if it is a false positive or a normal behavior ?

Regards