Issue was noticed by Grayson in For.tnite/Main.
Regression: No this occurred similarly in 4.27 still not 100% repro but some modification in sequence triggered toggling the mute track
Repro is not 100%
Result: The muted track will be toggled off
Result: Track remains muted
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-122314 in the post.