The skill work but change your drop for another ore random
Example: Mining 10 diamond normally you get the 10 Diamonnd + other ore when the skill work (normally 10 diamond + extra ore), but you get 9 Diamond + other random ore, you tecnically lost one diamand but the total items you get is 10. (change your drop)
The skill work but change your drop for another ore random
Example: Mining 10 diamond normally you get the 10 Diamonnd + other ore when the skill work (normally 10 diamond + extra ore), but you get 9 Diamond + other random ore, you tecnically lost one diamand but the total items you get is 10. (change your drop)