Looks like Chrome 79 was buggy ?
Could be. I just checked on another phone but that is also Chrome 79. Also checked using the Samsung browser and no sound there, either.
Tried in Safari on iPhone: Sound played and would not stop after switching to another tab.
Chrome on iPhone: Sound played and stopped when switching to another tab. But it wouldn't start again after switching back. Reloaded page and then it would restart after switching back. switched away and waited longer. Now can't get sound to play after switching back.
Hope that helps a little.