Keyboard closes when switching to speech-to-text keyboard

Hi there,

has anyone experienced the keyboard closing itsself when switching to the speech-to-text keyboard? I experiencing the problem when trying to use the text-to-speech keyboard on a textfield in a modal. I click the input which opens the keyboard. Then I click the little microphone icon to switch to the speech-text-keyboard. The speech-to-text keyboard appears and immediately disappears again.

Has anyone experienced the same or has any idea how i can prevent this?