Apologies if this is working as intended but the mass of a tile is suspiciously halved after digging it up.
I have tested it with Sandstone, Dirt, Sand, Copper and Coal and the mass of the pile left on the ground is always half of the original mass.
See attachments for details.
Steps to Reproduce
Hover over and check the details of a tile before digging it up. Hover over and check the details of the resource pile of the same tile after digging it up.
This issue has been closed either because it is not a bug or does not belong in the bug tracker.