Microsoft Edge mute tab button not functioning properly

Being able to mute individual tabs with the click of a button is a great feature and it's why I use Edge over Chrome. However, when I have a certain amount of tabs open-about 12 or so-I'm suddenly unable to click the speaker icon to mute a tab I'm not active on. I can hover over the speaker icon but instead of muting the tab, it forces me to first click on the tab for it to become active, THEN I can mute it. 

This defeats the entire purpose and is a major annoyance for people who frequently use the feature to mute other tabs. Please fix this! If there's another channel I can contact the devs through to get this through more urgently, please let me know.

Thanks!