option pm_tls_insecure = true to disable ssl verification not working with release 3.0.1-rc6

[pescobar]

skipping ssl verification with pm_tls_insecure = true works with provider version 3.0.1-rc5 but it doesn't work if I upgrade to 3.0.1-rc6

I am using this provider config and my proxmox instance uses a self-signed ssl cert.

provider "proxmox" {
  #pm_api_url = ""  # env var PM_API_URL
  #pm_user = ""     # env var PM_USER
  #pm_password = "" # env var PM_PASS
  pm_tls_insecure = true
  pm_log_enable = true
  pm_log_file   = "terraform-plugin-proxmox.log"
  pm_debug      = true
  pm_log_levels = {
    _default    = "debug"
    _capturelog = ""
  }
}

When using 3.0.1-rc6 I always get SSL errors like the ones below

Post "https://pve-dmz05:8006/api2/json/access/ticket": tls: failed to verify certificate: x509: certificate signed by unknown authority