The bug
Since the fix of MC-120664, all items added before 18w30b have 1 less usage than before it was fixed. In versions before 1.13.1, a wooden pickaxe would mine 60 blocks (the pickaxe broke at -1). In versions 18w30b and above, a wooden pickaxe would now mine 59 blocks (the pickaxe does not break at 0 because of MC-120664, but the durability is still 59 instead of 60 for 60 mining usage).
How to reproduce
Use the command in 1.13
/give @p minecraft:wooden_pickaxe{Damage:58}
You can break any block 2 times before the pickaxe breaks
Use the same command in 18w30b or any version above
→ ❌ It breaks at 0 as expected, but you only had 59 usage instead of 60
Confirmed for 1.16.4/20w46a