Here's the steps
1. Build a Nether Portal
2. Start Mining, once you start mining it looks like the block isn't mining when you mine, and sometimes you mine it too quickly, the game won't be able to register that mine, which makes you remine again, which wears down your tools faster
Linked issues
Comments 5
Like going into the nether is normal, it's when you go to break blocks it's hard to explain, but I will try, anyways, you go to mine with let's say an efficiency IV Netherite Pickaxe. Go up to a block of Netherrack and start mining, as you can see with Efficiency IV Netherite Pickaxe, you can mine netherrack fast, but sometimes if you keep mining, the game will bug out and you'll know when it bugs out because you can usually hear the mining noise when the block breaks, but when this bug happens it does not make a noise. If you mine a lot before the game can cope, the game will reload specific blocks that you've mined, which wears your durability on the Netherite Pickaxe/Any Pickaxes
This sounds like the same thing that was tracked at MCPE-48914, which is supposed to be fixed.
Are you using any resource packs when you experience this? Can you reproduce it at all in the overworld, for example mining stone with efficieny 5 and haste 2?
Do you only experience this issue when you are near striders (MCPE-146478)?
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Please clarify if you mean going into the nether and then mining, or mining near a nether portal.