[Bug]:`aws_s3_object` resource always replaced when `aws_s3_bucket` data is used in `bucket` argument

[javierbeaumont]

Terraform and AWS Provider Version

Terraform v1.12.1
on darwin_arm64
+ provider registry.terraform.io/hashicorp/aws v5.99.1

Affected Resource(s) or Data Source(s)

• aws_s3_object
• aws_s3_bucket

Expected Behavior

Upload an object to S3.
In the following executions, if there are no changes to the object, the resource does not change.

Actual Behavior

Upload an object to S3.
In the following executions, the aws_s3_object resource is replaced.

Relevant Error/Panic Output

# aws_s3_object.this must be replaced
-/+ resource "aws_s3_object" "this" {
      + acl                           = (known after apply)
      ~ arn                           = "arn:aws:s3:::bucket-name/file.zip" -> (known after apply)
      ~ bucket                        = "bucket-name" -> (known after apply) # forces replacement
      ~ bucket_key_enabled            = false -> (known after apply)
      + checksum_crc32                = (known after apply)
      + checksum_crc32c               = (known after apply)
      + checksum_crc64nvme            = (known after apply)
      + checksum_sha1                 = (known after apply)
      + checksum_sha256               = (known after apply)
      ~ content_type                  = "application/octet-stream" -> (known after apply)
      ~ etag                          = "e123456789abcdef0123456789abcdef0" -> (known after apply)
      ~ id                            = "file.zip" -> (known after apply)
      + kms_key_id                    = (known after apply)
      - metadata                      = {} -> null
      ~ server_side_encryption        = "AES256" -> (known after apply)
      ~ storage_class                 = "STANDARD" -> (known after apply)
      - tags                          = {} -> null
      ~ tags_all                      = {} -> (known after apply)
      ~ version_id                    = "FzVF5i_zc4CCsPjpg3X1PbXX80ktTLB8" -> (known after apply)
        # (12 unchanged attributes hidden)
    }

Sample Terraform Configuration

Click to expand configuration

data "aws_s3_bucket" "this" {
  bucket = "bucket-name"
}

resource "aws_s3_object" "this" {
  bucket = data.aws_s3_bucket.this.bucket 
  key    = "file.zip"
}

Steps to Reproduce

1. Create a bucket
2. Create a S3 object with aws_s3_object resource and reference a bucket with aws_s3_bucket data.
3. Re-aply Terraform

Debug Logging

Click to expand log output

GenAI / LLM Assisted Development

n/a

Important Facts and References

Similar behavior bug: #32529

Would you like to implement a fix?

No

[github-actions]

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