[QA] Unable to mute the video

### Description

Unable to mute the second video

### Reproduction Steps

Test Case - [1.6.5 amp-youtube/autoplay/ check unmuting]

Playground Link - https://playground.amp.dev/?url=https%3A%2F%2Fpreview.amp.dev%2Fdocumentation%2Fexamples%2Fcomponents%2Famp-video&format=websites

Steps:
1) Open playground link.
2) In the second video, try to mute the video.

Observed : Unable to mute.
https://recall.googleplex.com/projects/effc1364-8f41-414e-b99a-5eabccae10b7/sessions/3f5c73b0-c653-4fd3-b945-8d9286ebcd2f

Expected : User should be able to mute the video.

### Relevant Logs

_No response_

### Browser(s) Affected

Chrome, Firefox, Safari

### OS(s) Affected

NA

### Device(s) Affected

NA

### AMP Version Affected

2308112021001