[Bug]: Terraform Removes S3 Bucket Grant Permissions Without Code Changes

[dnlchen]

Terraform Core Version

1.2.9

AWS Provider Version

3.76.1

Affected Resource(s)

aws_s3_bucket

Expected Behavior

no change

Actual Behavior

      - grant {
          - permissions = [
              - "READ_ACP",
              - "WRITE",
            ] -> null
          - type        = "Group" -> null
          - uri         = "http://acs.amazonaws.com/groups/s3/LogDelivery" -> null
        }
      - grant {
          - id          = "0b05843ef4f7ad23454352435ggwergwerrebd5ebfger3425243gfgh" -> null
          - permissions = [
              - "FULL_CONTROL",
            ] -> null
          - type        = "CanonicalUser" -> null
        }

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

resource "aws_s3_bucket" "log_bucket" {
  bucket = "${var.env_prefix}${var.env}-${var.service}.${var.domain}-log"

  logging {
    target_bucket = var.s3_access_logs_bucket_name
    target_prefix = "${var.env_prefix}${var.env}-${var.service}.${var.domain}-log/"
  }

  lifecycle_rule {
    id                                     = "CleanupIncompleteMultiPartUploadsAndExpiredObjectDeleteMarkers"
    enabled                                = true
    abort_incomplete_multipart_upload_days = 7

    expiration {
      expired_object_delete_marker = true
    }
  }
}

resource "aws_s3_bucket_ownership_controls" "log_bucket" {
  bucket = aws_s3_bucket.log_bucket.id
  rule {
    object_ownership = "BucketOwnerPreferred"
  }
}

resource "aws_s3_bucket_acl" "log_bucket" {
  depends_on = [aws_s3_bucket_ownership_controls.log_bucket]

  bucket = aws_s3_bucket.log_bucket.id
  acl    = "log-delivery-write"
}

Steps to Reproduce

The bucket was created a while ago and there was no change.
However the Terraform run showed that some grant permissions would be removed.
Was this change by AWS or TF?

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[justinretzolk]

Hey @dnlchen 👋 Thank you for taking the time to raise this! There have been some somewhat recent changes on the AWS side with regards to bucket permissions (see #28353 for some more information), but I'm unsure if that's what we're seeing here. Are you able to try with a newer version of the provider and/or provide debug logs (redacted as needed)?

[justinretzolk]

Since we haven't heard back, I'm going to close this issue. If you're still having trouble, please feel free to open a new issue, referencing this one for context as needed.

[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.