Volume spikes on Bluetooth speaker when playing music and using speech to text simultaneously

I just got my new iPhone 14 Pro and When I’m playing music on my Bluetooth speaker( Marshall Emberton 1) while using speech to text function, the audio suddenly changes to loudest for a split second, which jump scared me. And so I had some experiment on it. Since I noticed when using AirPods while using speech to text, the audio dims down instead of stopping like on my old iPhone 11 Pro. So I think that’s the problem.

is there a way to fix this?