I am not sure if this is intended or a bug.
Start with a SW world, find sandy piles on a beach biome and prepare a shovel.
if you dig the sandy pile by continuously fast clicking on the right button of your mouse (Space Key won't work). Click as fast as you can.
There's a chance that you would harvest 4 sand. (depending on the frequency you pressed the right button)
On my computer the chance is around 50 50 to yield 2 or 4 sand.
Ref my DIY video:
Steps to Reproduce
1. Start with a SW world 2. find sandy piles and a shovel/golden shovel 3. dig the sandy pile by repetitiously click the right button on your mouse (click as fast as you can) 4. there's a chance that you would harvest 4 sand
This issue has been closed either because it is not a bug or does not belong in the bug tracker.