It worked fine on mojave, that is how I know it wasn’t my doing. The only variable change is the os. Another bug: sound turns on after I’ve muted it if any media starts playing. Defeating the entire purpose of muting audio. I guess macos knows best and I ought to play any and all audio out of those generous speakers at an appreciable volume no matter my surrounding. God forbid it were the other way and my video plays for a half second on mute before I notice.