Terraform plan fails when a manually deleted route is not found - Error retrieving route; Route not found

[codrinh]

Terraform Version

1.5.7

Affected Resource(s)

• mailgun_route

Expected Behavior

recreate missing resource

Actual Behavior

Throws an error:

Error retrieving route: UnexpectedResponseError URL=https://api.mailgun.net/v3/routes/6565de540d1867150b837193 ExpectedOneOf=[]int{200, 202, 204} Got=404 Error: {"message":"Route not found"}

Steps to Reproduce

• create a new route using mailgun_route ( in my case I used for_each, might occur on a single route )

locals{

environments = toset([
    "ab",
    "bc",
    "cd"
  ])
} 

resource "mailgun_route" "environments_catch_all" {
  for_each    = local.environments
  region      = "us"
  priority    = "999"
  description = ".*@${each.key}.mywebsite.io - terraform"
  expression  = "match_recipient('.*@${each.key}\\.mywebsite\\.io')"
  actions = [
    "forward('https://${each.key}.mywebsite.io')",
    "stop()"
  ]
}

• delete one route from the UI
• run terraform plan