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Bug with Dialogflow not sending the DTMF input correctly in $last user input variable to Generator

Hi,

I've found a bug with Dialogflow CX when using DTMF inputs over voice and a Generator. I'm using a Generator which looks at the past conversation and last user utterance to decide on what response to give to the user. I want to respond on free text and DTMF input from the user as our voice system accepts voice and DTMF input of booking reference which is a 6 digit number so works for both.

$last-user-utterance and $conversation outlined here; https://cloud.google.com/dialogflow/cx/docs/concept/generators

The generator is fairly straightforward and the prompt is not relevant except for the part that uses the $last-user-utterance

Prompt

"You are an AI assistant specializing in booking reference validation. Your primary function is to guide users towards inputting the correct booking reference number........

User: $last-user-utterance
Agent:"

Everything is working as expected until I want to pass a DTMF input over to the Generator and this is the bug, the $last-user-utterance variable is empty so it seems that any DTMF inputs are treated differently. This may be by "design" but even if that is the case, how can I actually access this value to send to the Generator? Whats even stranger is that when I look in the $conversation parameter also being passed to the Generator the DTMF inputs are in the conversation.

Also for some reason there is no way to access the dtmf input at page/route level or anywhere else,  so it's impossible to fix this issue. I was thinking if i had access to them I could pass them into the Generator manually.

 
Any help would be much appreciated.
 
thanks
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