Second instance in a group has its inboundPorts ignored (Google Compute Engine)

Create the first instance with set of inbound ports A - works as expected.

Create a second instance, with a different set of inbound ports B. This instance will have set A, not set B.

For example:

GoogleComputeEngineTemplateOptions options = computeService.templateOptions()
.as(GoogleComputeEngineTemplateOptions.class)
.inboundPorts(22)
;
Set<? extends NodeMetadata> nodes1 = computeService.createNodesInGroup(GROUP_NAME, 1, options);
nodes.addAll(nodes1);

options.inboundPorts(44);
Set<? extends NodeMetadata> nodes2 = computeService.createNodesInGroup(GROUP_NAME, 1, options);
nodes.addAll(nodes2);

In this example, nodes2 instance will have port 22 open, but not port 44.

Full test case to follow in a moment. I will investigate the cause and hope to propose a fix soon!