Provider produced inconsistent result after apply when HTTPS instead of https as protocol for an aws_sns_topic_subscription

[madpipeline]

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Terraform CLI and Terraform AWS Provider Version

Terraform: v0.12.24
Provider: 2.45

Affected Resource(s)

• aws_sns_topic_subscription

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

variable "sns_subscriptions" {
  description = "A list of objects with `protocol` and `endpoint` to be created as subscriptions to the sns topic."
  type = list(object({
    protocol = string
    endpoint = string
  }))
  default = []
}

resource "aws_sns_topic_subscription" "sns_subscriptions" {
  count                  = length(var.sns_subscriptions)
  topic_arn              = aws_sns_topic.sns.arn
  protocol               = element(var.sns_subscriptions.*.protocol, count.index)
  endpoint               = element(var.sns_subscriptions.*.endpoint, count.index)
  endpoint_auto_confirms = true
}

# value of var.sns_subscriptions is:
sns_subscriptions = [
  {
    protocol = "HTTPS"
    endpoint = "https://events.pagerduty.com/integration/XXXXXXX/enqueue"
  }
]

Debug Output

https://gist.github.com/madpipeline/43def6a230de01cdab0be20720efbc4b

Expected Behavior

module.sns.aws_sns_topic.sns: Refreshing state... [id=arn:aws:sns:us-east-1:XXXXXX:XXX]
module.sns.aws_sns_topic_subscription.sns_subscriptions[0]: Creating...
module.sns.aws_sns_topic_subscription.sns_subscriptions[0]: Creation complete after 2s [id=arn:aws:sns:us-east-1:XXXX:XXXX:XXXX]

Actual Behavior

module.sns.aws_sns_topic.sns: Refreshing state... [id=arn:aws:sns:us-east-1:XXXXXX:XXX]
module.sns.aws_sns_topic_subscription.sns_subscriptions[0]: Creating...
Error: Provider produced inconsistent result after apply

When applying changes to
module.sns.aws_sns_topic_subscription.sns_subscriptions[0], provider
"registry.terraform.io/-/aws" produced an unexpected new value for was
present, but now absent.

This is a bug in the provider, which should be reported in the provider's own
issue tracker.

Steps to Reproduce

1. terraform apply

Important Factoids

The issue goes away if you change the value of protocol from HTTPS to https.

[ewbankkit]

Similar:

• aws_sns_topic_subscription resource produced new value for was present but now absent #11737
• aws_sns_topic_subscription resource produced new value for was present but now absent #12692
• aws_sns_topic_subscription apply intermittently fails with "Root resource was present, but now absent" error #16695

[ewbankkit]

@madpipeline Thanks for raising this issue.
It has already been noticed in #11737. I'm going to close this one as a duplicate so that we can concentrate discussion in the linked issue.
Please add any additional comments there.

[madpipeline]

Hello @ewbankkit . Sorry for the duplicate. I didn't find that ticket when I looked if it was already reported. I'll be more careful next time.

[ewbankkit]

@madpipeline No worries, there are a lot of open issues.

[ghost]

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 feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!