Haste 1 is capable of instamining stone with a diamond/netherite efficiency 5 pickaxe
How to reproduce:
Power a beacon to haste 1 and use a diamond/netherite pickaxe enchanted with efficiency 5
Expected behavior:
Haste 1 shouldn't grant the ability to instamine stone, haste 2 should
I did some testing to confirm this, and it seems like the haste 1 mining speed buff may have been set to 25% instead of 20% by the fix to MCPE-102237. It also appears that the increase of haste 3 over haste 2 is closer to 10 or 15% instead of 20%.
To test the power of levels of the haste effect I set up command blocks and a scoreboard system to time how long it took to mine a block of obsidian with a diamond pickaxe. Here are my results. Note that the ticks are rounded to even numbers and may be off by 2 or 4 because I used a comparator and torch in the command block setup.
Haste level
Ticks to break, unenchanted
% speed increase
Ticks to break, Efficiency 5
% speed increase
0
138
36
1
98
30%
28
22%
2
72
48%
22
39%
3
54
61%
18
50%