Multiple utterance message in custom action validation

Why after response utter message immediately call intent ?

The scenario I want after the response utter_message the user selects one of those buttons then calls the intent

utter_message using button

Hello, Do not add text message from the bot after the buttons. Move this text before the buttons.

Hello @bcartign nice to meet you, thanks for reply for my question,

the condition is same, I validate in FormAction but when the slot is None why does the utterance message appear, the scenario is I just want to show suggestions if the input data is not found then give suggestions

This for details of my code in validation method under FormAction, maybe you can any solution for my case ?

Did you find a solution please ??