[Bug]: terraform tries to replace the machine type inplace

[hadmut]

What happened?

I change the machine type of a server definition, and terraform tries to do that:

Terraform will perform the following actions:

hcloud_server.web_test[0] will be updated in-place

~ resource "hcloud_server" "web_test" {
id = "57374955"
name = "webtest1"
~ server_type = "cax11" -> "cx22"
# (20 unchanged attributes hidden)
}

which necessarily fails since you can't change the server_type inplace.

What did you expect to happen?

destroy and replace

Please provide a minimal working example

create a simple cax11 machine, then change the type to cx22.

[jooola]

Could you provide use a code example so we can better understand and maybe reproduce your issue?

[hadmut]

OK, here it is (attached file with an attached .txt since github refuses .tf files as not supported, just remove the .txt suffix
hetzner_debuga.tf.txt
).

Do
terraform init
terraform apply

which should run smoothly and succeed and create a cx22 machine.

Then change machine type from cx22 to cax11 and again, terraform apply.

terraform should now tear down the cx22 machine and replace it with a cax11, but it doesn't:

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
~ update in-place

Terraform will perform the following actions:

hcloud_server.debuga will be updated in-place

~ resource "hcloud_server" "debuga" {
id = "57398965"
name = "debuga"
~ server_type = "cx22" -> "cax11"
# (19 unchanged attributes hidden)
}

Plan: 0 to add, 1 to change, 0 to destroy.

and then, of course, fails, since a x86 machine cannot be changed into an ARM machine just by changing attributes:

╷
│ Error: server type has incompatible architecture (invalid_server_type, 1719e2aab7fa2aa6)
│
│ with hcloud_server.debuga,
│ on hetzner_debuga.tf line 20, in resource "hcloud_server" "debuga":
│ 20: resource "hcloud_server" "debuga" {
│
╵

[jooola]

This looks like a duplicate of #853, therefor I'll close this issue.