Ore marker NOT VISIBLE - Ores placed with Voxel Hands NOT VISIBLE
When using voxel hands to place ore in a world, the only part of the voxel that changes is the outside.
Explanation: If I place a 10x10x20 voxel cube of iron ore within stone, only the outer edge of the stone changes to Iron. When I drill into that voxel, once the outer edge has been drilled, it appears as stone even though it is actually picking up Iron.
Further to this, any ore that is placed by voxel hands RARELY if ever shows up when holding a drill, or when using an ore detector. It seems to be random as to whether or not the game shows where they are located.