Beep sound when pressing Ctrl+"/" on MacOS

Hi, not sure if this is only for my system or for others as well: whenever I press ctrl+"/" (emacs “/”; the undo function), in TeXmacs on MacOS, it will always trigger a beep sound (not just going back to the original state sound effect). This becomes annoying when I am listening something else in the background. Is this the intended bahaviour for this hot key on MacOS? Are there other fixes that doesn’t include muting the entire system notification sound?

Thanks.