LaunchTemplateDataProperty/CfnLaunchTemplate_ fails with any complex property set

[McDoit]

Describe the bug
LaunchTemplateDataProperty/CfnLaunchTemplate_ fails with any complex property set

Works in 0.28

To Reproduce

Add the following to the C# HelloStack of the init app with language csharp

var launchTemplateData = new LaunchTemplateDataProperty
            {
                InstanceType = "t3.medium",
                Monitoring = new MonitoringProperty { Enabled = true }
            };

            var cfnLaunchTemplate = new CfnLaunchTemplate_(this, "template", new CfnLaunchTemplateProps
            {
                LaunchTemplateData = launchTemplateData,
                LaunchTemplateName = "template"
            });

And then run the app
Build works fine

Removing the Monitoring = new MonitoringProperty { Enabled = true } makes the app able to run

Exception message from the app:

Amazon.JSII.Runtime.JsiiException: While synthesizing test-stack/template: System.ArgumentException: Could not convert value 'System.Collections.Generic.Dictionary`2[System.String,System.Object]' with unrecognized type
Parameter name: value
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.ConvertAny(IReferenceMap referenceMap, Object value)
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.TryConvertPrimitive(IReferenceMap referenceMap, Object value, Boolean isOptional, PrimitiveType primitiveType, Object& result)
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.TryConvert(IOptionalValue optionalValue, IReferenceMap referenceMap, Object value, Object& result)
   at Amazon.JSII.Runtime.Services.Converters.FrameworkToJsiiConverter.TryConvertMap(IReferenceMap referenceMap, TypeReference elementType, Object value, Object& result)
   at Amazon.JSII.Runtime.Services.Converters.ValueConverter.TryConvert(IOptionalValue optionalValue, IReferenceMap referenceMap, Object value, Object& result)
   at Amazon.JSII.Runtime.CallbackExtensions.InvokeCallback(Callback callback, IReferenceMap referenceMap, IFrameworkToJsiiConverter converter, String& error)
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Services.Client.TryDeserialize[TResponse](String responseJson)
   at Amazon.JSII.Runtime.Services.Client.ReceiveResponse[TResponse]()
   at Amazon.JSII.Runtime.Deputy.DeputyBase.<InvokeMethodCore>g__GetResult|18_0[T](<>c__DisplayClass18_0`1& )
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeMethodCore[T](JsiiMethodAttribute methodAttribute, Object[] arguments, Func`3 beginFunc, Func`3 invokeFunc)
   at Amazon.JSII.Runtime.Deputy.DeputyBase.InvokeInstanceMethod[T](Object[] arguments, String methodName)
   at Amazon.CDK.CfnElement.Prepare()

Expected behavior
The app to run and produce a launch template with all properties set

Version:

• OS - Win 10
• Programming Language - C#
• CDK Version - 0.31

[jsteinich]

I'm getting what appears to be the same issue using CfnCloudFrontOriginAccessIdentityProps.CloudFrontOriginAccessIdentityConfig

[RomainMuller]

Seems to be the same issue as #3580

[McDoit]

I don't know if anything like that can help, as there is no un-typed assignments in this constructor?

var launchTemplateData = new LaunchTemplateDataProperty
            {
                InstanceType = "t3.medium",
                Monitoring = new MonitoringProperty { Enabled = true }
            };

[assyadh]

Fix in PR aws/jsii#736