Twitch Embedded Player Updates in 2020

The implementation of the new code worked so far for me. However, adjusting the volume in the embedded player has not worked since then. Previously, I had the following code, which I have now adjusted as follows after the change:

<p><iframe src="https://player.twitch.tv/?volume=1.00&amp;channel=radio_paralax&parent=www.radio-paralax.de" width="700" height="394" frameborder="0" scrolling="no"></iframe></p>

However, this does not change the volume, as before the change - The volume control remains in the middle at 50%, but I want it to be 100%. That worked before June 10, 2020.

Oh yes, what is the exact difference between a non-interactive stream that is integrated via iFrame as in my case and an interactive stream with JavaScript? What are the exact differences and advantages or disadvantages? Is there a good reason why you should definitely use an interactive stream? Somehow I can’t figure it out.