[BUG] Submodule unable to resolve object reference

[dkoder20]

Describe the bug
Submodule is unable to resolve a object reference to a variable value defined in the tfvars of the root module.

How you're running Regula
Please include versions of all relevant tools.

• Regula v2.9.3
• OPA v0.43.1
• Terraform v1.0.4
• AWS v4.54.0

Operating System
Macbook

Steps to reproduce

Below is the IaC terraform configuration to reproduce

./main.tf

variable "cloudwatch_metric_alarm" {
  type        = object({
    enable       = bool,
    actions      = list(string)
  })
}

variable "cloudwatch_metric_alarm_actions" {
  type = list(string)
}

module "cw_alarm" {
  source = "./modules/cloudwatch"
  cloudwatch_metric_alarm = var.cloudwatch_metric_alarm
  cloudwatch_metric_alarm_actions = var.cloudwatch_metric_alarm_actions
}

./terraform.tfvars

cloudwatch_metric_alarm = {
  enable  = true
  actions = ["arn:aws:sns:us-east-1:123456789012:example-sns-topic-name"]
}

cloudwatch_metric_alarm_actions = ["arn:aws:sns:us-east-1:123456789012:example-sns-topic-name"]

./modules/cloudwatch/main.tf

variable "cloudwatch_metric_alarm" {
  type        = object({
    enable       = bool,
    actions      = list(string)
  })
}

variable "cloudwatch_metric_alarm_actions" {
  type = list(string)
}

resource "aws_cloudwatch_metric_alarm" "this" {
  alarm_name          = "my-test-alarm"
  comparison_operator = "GreaterThanOrEqualToThreshold"
  evaluation_periods  = "2"
  alarm_description = "Alarm when query volume near upper limit"
  alarm_actions     = var.cloudwatch_metric_alarm.actions # error reported due to object reference
  # alarm_actions = var.cloudwatch_metric_alarm_actions
}

Run the following command from the root module:
regula run --var-file=terraform.tfvars

You will notice FG_R00240 being flagged complaining how an alarm action is not defined even though it is defined. Now, comment out the alarm_actions attribute line that has object reference and uncomment the alarm_actions attribute line that uses list(string) reference and run the above regula command again. The error reported for rule FG_R00240 disappears.