I'm not sure whether this is a fixable or at least known issue but it seems that the Ctrl + V coordinates are different from the map coordinates.
When breaking a block at for example -42 (y skipped) -1627 Ctrl + V cords there won't be a height update on the map for that block on map's coordinates, instead there will be a height update for a block that is -1 (y skipped) -1 () from the checked block implying that for some reason both sources show different numbers for one block.
I don't know how much of a bug that is but I just want to know whether it's fixable or not.