FlxSound not being able to set the pan after playing it

• Haxe version: 4.3.1
• Flixel version: 5.3.1
• OpenFL version: 9.2.1
• Lime version: 8.0.1
• Affected targets: cpp

Code snippet reproducing the issue:

package;

import flixel.FlxState;
import flixel.FlxG

class PlayState extends FlxState
{
	override public function create():Void
	{
		var sound = new FlxSound().loadEmbedded('sounds/[367] Ballerina_4');
		// sound.pan = 1 if i put it in here it works
		sound.play();
		sound.pan = 1; // does not work
	}
}

Observed behavior: the sound is not panning at all, stays at the center which is the pan of 0

Expected behavior: the sound should be coming from the right instead of the center

im assuming the issue is when openfl Sound clones the sound transform after playing it, specifically here https://github.com/openfl/openfl/blob/master/src/openfl/media/Sound.hx#L634

so the sound panning only works if you set it before actually playing the sound

Start with the supplied FlxSound reproduction, then inspect the linked OpenFL Sound.hx code around line 634 and how FlxSound applies pan after play(). Verify the cpp target behavior with pan set after playback; done means the sound moves right when pan is set to 1 after playing, with a regression check if the project has a suitable test location.