@gergelysotidm ### Terraform Version ``` Terraform v0.12.19 ``` ### Terraform Configuration Files See example project https://github.com/pascalwhoop/terraform_module_override_bug_example See below the unexpected and expected output https://gist.github.com/pascalwhoop/0c72b73f8f0fbfd7dcdc8f4183a0d671#file-both_runs-log ### Debug Output https://gist.github.com/pascalwhoop/0c72b73f8f0fbfd7dcdc8f4183a0d671 ### Steps to reproduce Create a `_override.tf` file and add an empty module override (or a module override with values in it). Once this is done, the "unsupported argument" check doesn't get executed and any unsupported arguments are simply dropped without error.