Error for ephemeral resource in module with count = 0

[pmac72]

Terraform Version

Terraform v1.11.2
on darwin_arm64

Terraform Configuration Files

main.tf

module "count_1" {
  count  = 1
  source = "./module"
}

module "count_0" {
  count  = 0
  source = "./module"
}

./module/main.tf

ephemeral "random_password" "this" {
  length = 10
}

Debug Output

trace output

Expected Behavior

No error reported when the module count is 0.

Actual Behavior

│ Error: Graph node has invalid dynamic subgraph
│
│ The internal logic for "module.count_0.ephemeral.random_password.this (expand)" generated an invalid dynamic subgraph: no roots found.
│
│ This is a bug in Terraform. Please report it!

Steps to Reproduce

1. terraform init
2. terraform apply

Additional Context

This is a simplified example to show the issue, the actual module where I came across this has variables that can cause the count to be >=0.

Also tested this with an ephemeral aws_ssm_parameter from the AWS Provider with the same result.

References

No response

Generative AI / LLM assisted development?

No response

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