Today I noticed at the Natural Site that when I broke a rock, no message popped up. I relogged, but it still happened 2 more times during that run. I was able to confirm that I still recieved 1 discovery point, but it did not tell me if I found an item, or a pokemon or what. Additionally, this also happened when I broke the shiny rock, though I am unsure of how many points I gained from that. I have seen this issue before, but am unsure if it is limited to the Natural site. Hope this report helps.