Cannot find buried treasure near red cross mark

I found a buried treasure map, and tried to find the buried treasure in Survival, but I couldn't find it although I have dug down like 5 blocks to the stones and sandstones and about 5 blocks around the red cross. However, I found a dungeon below the red cross, and it might cause the chest not to generate properly. I have attached screenshots of my map, and the dug area around me.