Not able to instabreak cobblestone

[Zhurxx]

I just built a cobblestone generator on my island, however I am not able to instabreak cobblestone for some reason. I am using a Stonk pickaxe and I have an active God Potion so I don't really understand why it's not working.

EDIT: The issue is solved, this requires a haste ring/haste artifact now.

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