Hello, 末岩
I did a test,
The device I use is iPhone 13 pro max & airpods pro2.
I'm in the copiilot app, and once I use voice, my airpods pro2 automatically disconnects.
I found that the problem you mentioned does exist.
I will report this issue, and I also recommend you provide feedback:
Microsoft attaches great importance to user experience, you can submit your ideas and suggestions through the Feedback Hub, and the development team will regularly review submissions for ideas or fixes. Please share the feedback link here after submitting as it will allow others on the forum to vote for your submission, including me. More votes will lead to more visibility and higher priority to the development team. We appreciate your feedback, please click Yes or No to help us improve the support experience and help others with similar concerns.
We look forward to hearing back from you.
Best Regards
Patch - MSFT | Microsoft Community Support Specialist