Having rummaged around the forums a bit, I've found this thread which is almost certainly a bug report that duplicates my suggestion: https://forums.factorio.com/viewtopic.php?f=182&t=117363&p=624953&hilit=alert+quality#p624953 It's currently in "Assigned" status - does this me...

TL;DR Alert icons can have qualities, from Common to Legendary. When a programmable speaker shows an alert, the quality information is lost, and only the icon is shown. I think the quality should also be shown What? I can configure an alert on a speaker with a quality, like this Legendary 5 alert: ...