Come on Apple! You've really dropped the ball when it comes to Siri and HomeKit. Both are inferior to their alternatives but I can understand that. Having teams work together to ensure the level of integration that Apple is known for, will definitely slow down development. This however means that you have no excuses when your inferior products/services don't just work.
I've used Siri to run Good night or Good morning scenes but with iOS 15.4 there is no way to run either through Siri. No matter how I say the command, Siri will just respond for example 'And good morning to you too'. It will just pick up the words 'good morning' or 'good night' and ignore anything else that suggests that it's an actual command ("Hey Siri, run the Good morning scene"). This literally means that Siri just became more stupid.
This problem was posted Mar 18th - I wonder if Apple can do anything to fix it before two months have passed...