Suggested conversion to HCL2 expression is causing Ambiguous attribute key error

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Prerequisites

[x] Ensure you have latest version of plugin installed
[x] Search for possible issue duplicates

Installation details

[x] IDE version (Help->About->Copy to Clipboard)

IntelliJ IDEA 2020.1.2 (Ultimate Edition) Build #IU-201.7846.76, built on June 1, 2020

[x] intellij-hcl plugin version (Settings->Plugins) 0.7.9
[x] Terraform version (terraform -v) 0.12.26

Terraform Configuration Files

provider "aws" {
  region = "eu-central-1"
}

variable "tags" {
    type = map(string)
    default = {
        Terraform = "true"
    }
}

variable "inventory_tag" {
  type = string
  default = "Inventory"
}

resource "aws_instance" "default" {
  ami = "ami-0b6d8a6db0c665fb7"
  instance_type = "t3.nano"
  tags = merge({
    "${var.inventory_tag}": "foobar"  # <-------- THIS LINE
  }, var.tags)
}

After accepting the suggested change:

resource "aws_instance" "default" {
  ami = "ami-0b6d8a6db0c665fb7"
  instance_type = "t3.nano"
  tags = merge({
    var.inventory_tag: "foobar"
  }, var.tags)
}

Exception

$ terraform plan

Error: Ambiguous attribute key

  on main.tf line 21, in resource "aws_instance" "default":
  21:     var.inventory_tag: "foobar"

If this expression is intended to be a reference, wrap it in parentheses. If
it's instead intended as a literal name containing periods, wrap it in quotes
to create a string literal.

Expected Behavior

Plugin should not suggest to change such interpolations to HCL2 expressions.

Actual Behavior

Plugin is suggesting changes which leads to Terraform error.

Steps to Reproduce

Accept suggested change ‘Convert to HCL2 expression’
Execute terraform plan command

VladRassokhin / intellij-hcl

Suggested conversion to HCL2 expression is causing Ambiguous attribute key error #303