pyatv: volume_set not working with tts.cloud_say

Describe the bug

I am trying to set the volume level when using the tts.cloud_say service in home assistant.

I can see the volume is changed correctly as per the first action but then when the HomePod plays the tts it automatically changes the volume to what appears to be 0.2, after it finishes and playing it sets the volume back to what was set in the first action even though I do not specify a second volume set action.

It appears to be related to the fact the tts message is played using RAOP which has different volume controls but I cannot see how to set those so the tts messages are played at a volume they can be heard?

Error log

<place log here>

How to reproduce the bug?

Use these actions in a home assistant automation

action:

• service: media_player.volume_set data: volume_level: 0.7 target: entity_id: media_player.living_room_homepod
• delay: hours: 0 minutes: 0 seconds: 5 milliseconds: 0
• service: tts.cloud_say data: entity_id: media_player.living_room_homepod message: Test Message

What is expected behavior?

The tts message is played at the volume set in the automation.

Operating System

HassOS

Python

3.9

pyatv

latest?

Device

HomePod Mini

Additional context

None