Shortcuts: "Speak text" action uses Siri voice instead of selected voice

Hello,

I am trying to create the following simple shortcut in the Shortcut app.

I have added the "Text" action and would like to have it read aloud. So I have added the "Speak text" action after the "Text" action. Then, if I run the shortcut from the Shortcut app, the message is spoken using the voice selected in the "Speak text" action without a problem, however, when I run the shortcut using Siri, Siri always says "Your shortcut says..." and then she reads the message using the Siri voice instead of the voice selected in the "Speak text" action.

Please, how can I have Siri read the message using the voice selected in the "Speak text" action?

I am using iPhone SE, iOS 13.3.1, and Shortcuts 2.2.2.

Thanks in advance.

Kind regards

Adam