The miner's ghost in the \"new burial ground\" and a magic lamp (The Witcher 3: Wild Hunt)

before I had a lantern, I found a treasure in this location (velen, the very bottom of the map under the island "column"), stole it and ran away from the midday that appeared. upon reaching the normal level and acquiring a lantern, he returned and slammed it, but the lantern icon on the map remained the same, and the miner is visible in the green light, but he just works with a pickaxe and nothing happens. you have to look at it for a long time, or you can not look at all, or did I do something in the wrong sequence, and it freezes? it's just that after the quest with the ring in another place, the lantern icon on the map disappeared after I watched the scene in the cemetery.