Tekkit Classic blocks wouldn't drop after being destroyed (single-player)

Started up tekkit classic version 3.1.2 in single-player, and I was trying to mine. After mining stone blocks repeatedly, with a diamond pickaxe, I noticed that blocks were not dropping. Tried with dirt, still nothing. When I try to drop an item, it also disappears.

I tried deleting Technic Launcher, and re-downloading, and it but I still have the same problem. I am having this problem across all single player worlds.

Is there anything I can do to fix this?

Solution 1:

Go into your inventory and click the "Options" button in the bottom left corner. Now, on the right side of the screen there should be a button labeled "Item Drops:Disabled." Click on the button to change it to "Item Drops: Enabled."