So I was watching some older videos where you could have a diamond pickaxe with efficiency V and the haste II buff from a beacon and mine blocks incredibly fast, like.. faster than breaking blocks in creative. I tried it on my single player and couldn't get it to work.
Is it nerfed or am I doing something wrong?
If you have enough blocks in a proper pyramid you should be able to choose 2 effects, one on the left and one on the right, once you choose Haste on the left it should be available as a choice on the right as well, in order to have Haste II it needs to be chosen on both sides.
I found it a bit fiddly to tell how to chose the effects.
I'm still not sure if you can choose and pay for both at the same time or if you need to pay for the left side first and then open the interface again.