Overriding dependant DA inputs is not working in addons tests

[ocofaigh]

I am trying to override default variable values for dependant DAs like so:

func TestVpcAddonDefaultConfiguration(t *testing.T) {
	t.Parallel()

	options := testaddons.TestAddonsOptionsDefault(&testaddons.TestAddonOptions{
		Testing:       t,
		Prefix:        "vpc-def",
		ResourceGroup: resourceGroup,
		QuietMode:     false, // Suppress logs except on failure
	})

	options.AddonConfig = cloudinfo.NewAddonConfigTerraform(
		options.Prefix,
		"deploy-arch-ibm-slz-vpc",
		"fully-configurable",
		map[string]interface{}{
			"prefix": options.Prefix,
			"region": "us-south",
		},
	)

	// Disable target / route creation to prevent hitting quota in account
	options.AddonConfig.Dependencies = []cloudinfo.AddonConfig{
		{
			OfferingName:   "deploy-arch-ibm-cloud-monitoring",
			OfferingFlavor: "fully-configurable",
			Inputs: map[string]interface{}{
				"enable_metrics_routing_to_cloud_monitoring": false,
			},
			Enabled: core.BoolPtr(true),
		},
		{
			OfferingName:   "deploy-arch-ibm-activity-tracker",
			OfferingFlavor: "fully-configurable",
			Inputs: map[string]interface{}{
				"enable_activity_tracker_event_routing_to_cos_bucket": false,
				"enable_activity_tracker_event_routing_to_cloud_logs": false,
			},
			Enabled: core.BoolPtr(true),
		},
	}

	err := options.RunAddonTest()
	require.NoError(t, err)
}

However these override are not being set. The defaults are still being used. Syntax was taken from docs. is there a bug?