vyos_config and VTI

Ansible version “ansible-2.3.1.0-1.el7.noarch”
VyOS 1.1.7

When using vyos_config to add VTI configuration it hangs indefinitely when the VTI has not yet been associated with any VPN.

When adding the VTI interface directly (via the command line) I see the following warning after commit:

Warning: Interface vti1 is not referenced in vpn configuration.

Given this is a warning we should be able to proceed.

If I manually configure the VTI I can proceed with VPN configuration (via vyos_config) as expected.

Is there any workaround or is this a bug?

Karl.