Quest: Artisan's Saga: Prelude to Hope - 7540
After placing first explosive, none of the other spots will update. I tried a few spots first, gave me the message that I wasn't in range, and then was able to place it, but any other spot, I no longer received the message and was not able to place it. On my final try, I went back to Veteran Hanoru Redmist and it turns out, the quest was marked complete even though I only placed one explosive.