Alb event doesn't completely register lambda on TargetGroup

The example in the serverless ‘alb’ how-to doesn’t work. The lambda is not ‘registered’ with the TargetGroup.

I can manually assign the lambda in the “Targets” tab for the Target Group in the AWS console - and everything works.

Has anyone else experienced this? It looks like the ‘alb’ event is still not fully baked.