Terraform 1.10 - Error: Can't change variable when applying a saved plan

[pauldtill]

Terraform Version

Terraform v1.10.0

Terraform Configuration Files

variable "this_is_a_list_variable" {
  type    = list(string)
  default = []
}

Debug Output

https://gist.github.com/pauldtill/693a77980b7409e91d8c506eecb23085

Expected Behavior

Terraform apply is successful.

Actual Behavior

Terraform plan works OK - terraform apply fails with -

│ Error: Can't change variable when applying a saved plan

Steps to Reproduce

export TF_VAR_this_is_a_list_variable='["stuff"]'
terraform plan -input=false -out=plan.tfplan
terraform apply plan.tfplan

Additional Context

This seems to be an issue with the way a TF_VAR list environment variable is stored in the plan compared to how it is seen at runtime for apply - confirmed this does not occur at v1.9.8 with the same basic config / environment variable.

References

No response

[radeksimko]

Hi @pauldtill
Thank you for the report. I believe this is the same issue as reported in #36106

It will be fixed as part of #36121 - I ran the attached config/steps through and can confirm the PR fixes it.

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