Spark blocked due to multiple webhooks / sec

My Dialogflow API was integrated with Spark/Webex and worked for 2 years, then it was blocked because:

(Webex Developer Support) "We had to check with engineering on this and found that your bot had been blocked due to it creating multiple webhooks per second. That would mean that something in your code is causing webhooks to constantly be created for some reason. Do you have a way of seeing why this was happening?"

(Dialogflow Support reply) "Regarding the code that may cause webhooks to constantly be created, unfortunately, we are unable to assist as the issue is more closely related to the open source integration code. For issues related to the open source integration, kindly report the issue in the issues section of Github."

All my other integrations work fine (or do not worry about the multiple webhooks) though I don't know if it's been a long-term issue but Spark only just started monitoring that problem.