Subnet creation fails due to locked virtual network

[doherty100]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ X ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

Provision terraform-azurerm-vnet-shared

Any log messages given by the failure

AnotherOperationInProgress: Another operation on this or dependent resource is in progress.

Expected/desired behavior

Configuration should apply with no errors

OS and Version?

N/A

Versions

AzureSandbox v2.10.1

Mention any other details that might be useful

In this case the subnet that failed was snet-adds-01 in virtual network vnet-shared-01.