[Bug]: resource/aws_lb_target_group - Forces replacement of resource after importing

[posquit0]

Terraform Core Version

1.3.3

AWS Provider Version

4.36.1

Affected Resource(s)

• resource/aws_lb_target_group

Expected Behavior

After importing the existing IP target group(IPv4 address type), it should be safe from replacement by Terraform.

Actual Behavior

After importing the existing IP target group(IPv4 address type), Terraform always makes a plan to forcibly replace the target group.

  # module.nlb_ip_target_group["nlb-ip-traefik"].aws_lb_target_group.this must be replaced
-/+ resource "aws_lb_target_group" "this" {
      ~ arn                                = "arn:aws:elasticloadbalancing:ap-northeast-2:xxxxxxxxxx:targetgroup/nlb-ip-traefik/dddd" -> (known after apply)
      ~ arn_suffix                         = "targetgroup/nlb-ip-traefik/dddd" -> (known after apply)
      ~ id                                 = "arn:aws:elasticloadbalancing:ap-northeast-2:xxxxxxxx:targetgroup/nlb-ip-traefik/dddd" -> (known after apply)
      + ip_address_type                    = "ipv4" # forces replacement
      + lambda_multi_value_headers_enabled = false
      + load_balancing_algorithm_type      = (known after apply)
        name                               = "nlb-ip-traefik"
      + protocol_version                   = (known after apply)
      + slow_start                         = 0
        tags                               = {

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

resource "aws_lb_target_group" "this" {
  ...

  target_type     = "ip"
  ip_address_type = "ipv4"
  ...
}

Steps to Reproduce

• Create NLB IP target group with IPv4 address type.
• Import the target group to terraform.
• Execute terraform plan.
• You can see that terraform will try to replace the target group.

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

• https://github.com/hashicorp/terraform-provider-aws/releases/tag/v4.27.0

Would you like to implement a fix?

No response

[github-actions]

Community Note

Voting for Prioritization

• Please vote on this issue by adding a 👍 reaction to the original post to help the community and maintainers prioritize this request.
• Please see our prioritization guide for information on how we prioritize.
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for issue followers and do not help prioritize the request.

Volunteering to Work on This Issue

• If you are interested in working on this issue, please leave a comment.
• If this would be your first contribution, please review the contribution guide.

[ewbankkit]

Relates #26320.

[bschaatsbergen]

Being picked up by @brittandeyoung in #27464

[github-actions]

This functionality has been released in v4.37.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.