Why is "terraform apply" reporting an unexpected new value in my workflow?

Sometimes, we add new parameters to our workflows, which offer new functionality. Existing workflows are silently "upgraded" to support this new parameter, which means they gain a new "parameter binding"

This can result in a Terraform error that looks like this:

When applying changes to incident_workflow.[name], provider "provider[\"registry.terraform.io/incident-io/incident\"]" produced an unexpected new value: .steps[1].param_bindings: new element 3 has appeared.

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

Error: Provider produced inconsistent result after apply

What Terraform is saying here, is that a new value for a parameter appeared that it wasn't expecting. We don't yet handle this gracefully, and we're not entirely sure if there's a good solution here yet.

We're going to release a new version of our Terraform provider to fix this, but in the meantime, if param_bindings is complaining about being changed, then they should add the missing parameter binding.

Example:

!               param_bindings = [
-                   {
                    },
                    # (3 unchanged elements hidden)
                ]
                # (1 unchanged attribute hidden)
            },
        ]

That output is saying that Terraform is missing a {} param binding — and they should add this if they want to unblock themselves. The new version of our Terraform provider will mean this step isn't required.