terraform-provider-rancher2: rancher2 bootstrap doesn't work anymore with rancher v2.6.0

Here is my terraform script, which uses rancher v2.6.0 (latest).

terraform {
  required_providers {
    helm = {
      source  = "hashicorp/helm"
      version = "2.3.0"
    }
    rancher2 = {
      source = "rancher/rancher2"
      version = "1.17.2"
    }
  }
}

provider "helm" {
  kubernetes {
    config_path = var.kubeconfig_path
  }
}

provider "rancher2" {
  alias     = "bootstrap"
  api_url   = var.rancher_hostname != null ? "https://${var.rancher_hostname}" : "https://rancher.${var.lb_address}.nip.io"
  bootstrap = true
  insecure  = true
}

provider "rancher2" {
  alias     = "admin"
  api_url   = var.rancher_hostname != null ? "https://${var.rancher_hostname}" : "https://rancher.${var.lb_address}.nip.io"
  token_key = rancher2_bootstrap.setup_admin.token
  insecure  = true
}

resource "helm_release" "cert_manager" {
  name             = "cert-manager"
  namespace        = "cert-manager"
  repository       = "https://charts.jetstack.io"
  chart            = "cert-manager"
  version          = "1.5.3"

  wait             = true
  create_namespace = true
  force_update     = true
  replace          = true

  set {
    name  = "installCRDs"
    value = true
  }
}

resource "helm_release" "rancher" {
  name = "rancher"
  namespace = "cattle-system"
  chart = "rancher"
  repository = "https://releases.rancher.com/server-charts/latest"
  depends_on = [helm_release.cert_manager]

  wait             = true
  create_namespace = true
  force_update     = true
  replace          = true

  set {
    name  = "hostname"
    value = var.rancher_hostname != null ? var.rancher_hostname : "rancher.${var.lb_address}.nip.io"
  }

  set {
    name  = "ingress.tls.source"
    value = "letsEncrypt"
  }

  set {
    name  = "letsEncrypt.email"
    value = var.letsencrypt_issuer
  }
}

resource "rancher2_bootstrap" "setup_admin" {
  provider   = rancher2.bootstrap
  password   = var.rancher_admin_password
  telemetry  = true
  depends_on = [helm_release.rancher]
}

I get the following error:

│ Error: [ERROR] Timeout login with admin user: Doing  user logging: error Unauthorized
│ 
│   with module.rancher_init.rancher2_bootstrap.setup_admin,
│   on module-rancher-init/main.tf line 80, in resource "rancher2_bootstrap" "setup_admin":
│   80: resource "rancher2_bootstrap" "setup_admin" {
│ 

using rancher v2.5.9 from stable doesn’t produce any error.