I'm having an issue with the Vapi voice assistant Custom function calling. Previously it worked fine but after changing the Assistant's voice from the dashboard custom functions are not being called. More Details : I've created custom functions in Dashboard Assistants-> Functions-> Custom Functions. When I ask voice assistant to make any changes it was calling functions related to it. But after changing the voice assistant, it's not calling any functions, and now I can't even get the previous voice assistant working. It just responds that I've updated this data but is not calling any functions. If Anyone can help me to resolve this issue Please let me know.