Please note that Google Groups forum is meant for general discussion of the platform, not specific technical issues. You can find more info about Community Support Overview on Google Groups here.
For any technical queries or if you think your issue is related to code, you can post at the Stack Overflow or Server Fault and a community of developers will assist you. For that I can see you have already posted at the StackOverflow thread here.
I would like to encourage you to report this technical issues or this feature request at the Public Issues by selecting the Dialogflow component under AI and Machine Learning from here. One of the Google Cloud Platform Support agent will be happy to assist you.