Terraform apply command destroys my newly imported resources

I’m using terraform to deploy infrastructure in Oracle Cloud (OCI) and I have some resources such as virtual machines that were deployed manually.
I created the below terraform script to import a VM

variable "tenancy_ocid" {}
variable "user_ocid" {}
variable "fingerprint" {}
variable "private_key_path" {}
variable "region" {}

variable "compartment_ocid" {
  type       = string
  default    = "ocid1.compartment.oc1..aaaaaaaa....."
}

variable "availability_domain" {
  type       = string
  default    = "phiX:US-ASHBURN-AD-1"
}

variable "subnet_ocid" {
  type = string
  default    = "ocid1.subnet.oc1.iad.aaaaaaaa......"
}

variable "ssh_public_key_file"{
    type = string
    default = "/Users/cgperalt/.ssh/id_rsa.pub" 
}

provider "oci" {
  tenancy_ocid      = var.tenancy_ocid
  user_ocid         = var.user_ocid
  fingerprint       = var.fingerprint
  private_key_path  = var.private_key_path
  region            = var.region
  version           = "~> 3.17"
}

# get latest Oracle Linux 7.7 image
data "oci_core_images" "oraclelinux-7-7" {
  compartment_id = var.compartment_ocid
  operating_system = "Oracle Linux"
  operating_system_version = "7.7"
  filter {
    name = "display_name"
    values = ["^([a-zA-z]+)-([a-zA-z]+)-([\\.0-9]+)-([\\.0-9-]+)$"]
    regex = true
  }
}

resource "oci_core_instance" "example" {
  count               = 2
  compartment_id      = var.compartment_ocid
  availability_domain = var.availability_domain
  subnet_id           = var.subnet_ocid
  display_name        = "example_TF-1${count.index}"
  image               = lookup(data.oci_core_images.oraclelinux-7-7.images[0], "id")
  shape               = "VM.Standard1.1"

  metadata = {
    ssh_authorized_keys = "${file(var.ssh_public_key_file)}"
  }
}

then I ran

terraform import oci_core_instance.example <vm_id>

and then if I do
terraform plan
terraform marks the imported machine to be destroyed.
Does anybody know why this is happening ?

Thanks so much

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