Tools wear off faster in Nether

Hello everyone, I found a weird bug. It's about my tools wearing out faster in the Nether rather than doing that in the overworld. Is this an oversight bug? (Only works to pickaxes, sorry about that!)

1. Make a Pickaxe (Iron, Gold, Diamond, any)

2. Go into the nether portal where you head into the Nether.

3. With your pickaxe, start mining netherrack, quartz ore, or Nether Gold Nugget Ore, and watch your pickaxe wear its durability faster.

Observed Results: Quicker wear on pickaxes in the Nether VS The Pickaxes in the Overworld.

Expected Results: Quicker wear on pickaxes in the Nether