Modules dependency can't understand some moments

Terraform
1

Hi, all

module "cp_os_update" {
  depends_on = [module.vsphere_cp]
}

module "cp_pre_install" {
  depends_on = [module.cp_os_update]
}

module "cp_install" {
  depends_on = [module.cp_pre_install]
}

module "cp_config" {
  depends_on = [module.cp_install]
}

module "cp_ssh_config" {
  depends_on = [
    module.cp_install,
    module.hv_install,
    module.hv_xen_reboot,
    module.bs_install,
    module.ds_install,
    module.cp_config,
  ]
}

module "cp_cloudboot" {
  depends_on = [
    module.cp_config,
    module.cp_install,
  ]
}

resource "null_resource" "cp_wait_httpd" {
  depends_on = [
    module.cp_ssh_config,
    module.cp_cloudboot,
    module.cp_config,
 ]
}

resource "null_resource" "cp_configuration_done" {
  depends_on = [
    null_resource.cp_wait_httpd,
 ]
}

This modules dependency are working fine, like excepted:

module.vsphere_cp.vsphere_virtual_machine.server: Creating...
module.vsphere_cp.vsphere_virtual_machine.server: Still creating... [10s elapsed]
...
module.vsphere_cp.vsphere_virtual_machine.server: Still creating... [1m50s elapsed]
module.vsphere_cp.vsphere_virtual_machine.server: Creation complete after 1m54s [id=421f732e-5c11-1912-915f-ca9911e9799e]

module.cp_os_update.null_resource.update: Creating...
module.cp_os_update.null_resource.update: Provisioning with 'remote-exec'...

but if I remove module.cp_config from depends_on of null_resource.cp_wait_httpd the order creating resources are changed

resource "null_resource" "cp_wait_httpd" {
  depends_on = [
    module.cp_ssh_config,
    module.cp_cloudboot,
 ]
}

null_resource.cp_wait_httpd: Creating...
null_resource.cp_wait_httpd: Provisioning with 'local-exec'...

null_resource.cp_wait_httpd: Still creating... [10s elapsed]

module.vsphere_cp.vsphere_virtual_machine.server: Still creating... [10s elapsed]
null_resource.cp_wait_httpd: Still creating... [30s elapsed]

module.vsphere_cp.vsphere_virtual_machine.server: Still creating... [30s elapsed]
null_resource.cp_wait_httpd: Still creating... [40s elapsed]

module.vsphere_cp.vsphere_virtual_machine.server: Still creating... [40s elapsed]
null_resource.cp_wait_httpd: Still creating... [50s elapsed]

Why null_resource.cp_wait_httpd started before module.vsphere_cp
but not the end of configuration?