As far as I understand, when people publish community decks they tend to use the community version. Partially for that reason, it’s easy for them to not notice suggestions/feedback made by the community for a set. The suggestions tab does pulsate when there are suggestions, but this is still a bit hard to notice, and I’m not 100% whether this happens on the community deck itself or not.
In order to fix this, it might be a good idea to send a notfication to the publisher when there are suggestions for a deck. A problem I see with this would be the user potentially getting spammed by notifications for particularly popular decks. In order to avoid this, instead of a phone/browser notification, there could be something that is clearly visible on the website outside of the deck itself. For example, there could be a number on the home page that notifies the user of “Unreviewed Suggestions”