Consul backend locking not working as expected

[ntrvic]

I am trying to setup consul as a backend w/ locking.
When I run env CONSUL_HTTP_SSL=true terraform apply -auto-approve=true -lock-timeout=100s -lock=true

and then right after in parallel I run env CONSUL_HTTP_SSL=true terraform apply -auto-approve=true -lock-timeout=100s -lock=true

With instance 2 I see...

Acquiring state lock. This may take a few moments...
data.vsphere_datacenter.datacenter: Refreshing state...
data.vsphere_network.network: Refreshing state...
data.vsphere_datastore.datastore: Refreshing state...
data.vsphere_resource_pool.resource-pool: Refreshing state...
data.vsphere_virtual_machine.template: Refreshing state...
vsphere_virtual_machine.vm: Refreshing state... (ID: 42271ab5-6807-872e-2aab-faf26182bfc2)
Failed to save state: consul CAS failed with transaction errors: [0xc42022c280]

This also occurs with plans and refreshes.

If I try to run again.... I see

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

DEBUG logs

2018-02-21T15:07:21.143-0500 [DEBUG] plugin.terraform-provider-vsphere_v1.1.0_x4: 2018/02/21 15:07:21 [DEBUG] Cloning virtual machine "/DA3/vm/provtest-001.blah.net"
2018/02/21 15:07:21 [ERROR] root.provtest-001: eval: *terraform.EvalApplyPost, err: 1 error(s) occurred:

* vsphere_virtual_machine.vm: error cloning virtual machine: The name 'provtest-001.blah.net' already exists.
2018/02/21 15:07:21 [ERROR] root.provtest-001: eval: *terraform.EvalSequence, err: 1 error(s) occurred:

* vsphere_virtual_machine.vm: error cloning virtual machine: The name 'provtest-001.blah.net' already exists.
Failed to save state: consul CAS failed with transaction errors: [0xc420454800]


2018/02/21 15:07:21 [DEBUG] plugin: waiting for all plugin processes to complete...

[ghost]

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