Mysql: not updating user password when changed

[michaelmass]

Terraform Version

Terraform v0.11.11
+ provider.mysql v1.5
+ provider.random v2.00

Affected Resource(s)

List the resources as a list:

• mysql_user

Terraform Configuration Files

resource "mysql_user" "default" {
  user               = "${format("%.32s", var.name)}"
  host               = "%"
  plaintext_password = "${random_string.user_password.result}"

  depends_on = ["aws_rds_cluster_instance.default"]

  lifecycle = {
    prevent_destroy = true
  }
}

Expected Behavior

What should have happened?

The mysql user password should be updated when the random_string.user_password.result changes.

Actual Behavior

What actually happened?

The mysql user password isn't updated.

Important Factoids

This operation is done on a resource aws_rds_cluster_instance.