Lambda layer argument not being able to ignore changes

[pawelhajduk-devops]

Description

Hi

I was looking for a solution for this but i failed unfortunately. I'm creating a lambda function and lambda layer using this module. It seems that there is no way to decouple lambda layer changes that are applied in lambda function. The issue i have is exactly as described here #188 but the replies were about source code of layer/lambda and not direct layer reference in lambda function itself

• [ x] ✋ I have searched the open/closed issues and my issue is not listed.

⚠️ Note

Before you submit an issue, please perform the following first:

1. Remove the local .terraform directory (! ONLY if state is stored remotely, which hopefully you are following that best practice!): rm -rf .terraform/
2. Re-initialize the project root to pull down modules: terraform init
3. Re-attempt your terraform plan or apply and check if the issue still persists

Versions

• Module version [Required]:
  8.1.0

• Terraform version:
  1.13.3

• Provider version(s):
  6.11.0

Reproduction Code [Required]

`module "lambda" {
  source = "terraform-aws-modules/lambda/aws"

  function_name = var.function_name
  description   = var.description
  handler       = var.handler
  runtime       = "nodejs22.x"
  memory_size   = var.memory_size

  kms_key_arn  = var.kms_key_arn
  publish      = true
  timeout      = var.timeout
  tracing_mode = var.tracing_mode

  layers = var.layers_arns #here is the issue - cannot put ignore changes on it

  create_package          = false
  local_existing_package  = "${path.module}/lambda-init-code/init.zip"
  ignore_source_code_hash = true
  create_layer            = false

  cloudwatch_logs_retention_in_days = var.logs_retention_in_days
  attach_dead_letter_policy         = false
  environment_variables             = var.environment_variables
  attach_policy_statements          = false

  attach_policies    = true
  number_of_policies = var.number_of_policies

  policies = var.policies
  create_unqualified_alias_lambda_function_url = false
  create_unqualified_alias_allowed_triggers    = false

  tags = var.tags
}

// =============================================================================
module "lambda_alias" {
  source = "terraform-aws-modules/lambda/aws//modules/alias"

  refresh_alias = false

  name = "LIVE"

  function_name    = module.lambda.lambda_function_name
  function_version = module.lambda.lambda_function_version


  create_version_allowed_triggers = false

  allowed_triggers = var.allowed_triggers
}


module "lambda_layer" {
  source = "terraform-aws-modules/lambda/aws"

  create_layer   = true
  create_package = false

  layer_name               = "${local.prefix_name}-packages"
  description              = "Lambda layer for my packages"
  compatible_architectures = ["x86_64"]

  
  local_existing_package = "${path.module}/files/shared-libs.zip"
  ignore_source_code_hash = true
}



`

Steps to reproduce the behavior:

No Yes

Expected behavior

should be possible to set ignore changes on lambda function in argument layers

Actual behavior

terraform wants to update lambda every time i deploy new version via CI/CD

Terminal Output Screenshot(s)

Additional context