Drone hack cooldown

After I send drone to a portal and hack it , there should be cooldown 120 seconds , but when I try to hack it again after 2minutes or even 30 minutes with that drone (which didn't move) I can't because the portal is still on cooldown. And when I come to that portal and try to hack it without a drone I still can't because there is cooldown and portal is burnt.
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You can only hack a portal via drone once per move. Once you have hacked, you cannot hack it again and you need to move it. The normal cooldown does not apply here.