I noticed this while breaking Netherack with a stone pickaxe. You have to be really carefull to not destroy anything, as blocks break almost instantly, like in creative.
And this triggers some sort of a real bug, as afterwards it has a chance to apply to another block, too. Today, I got to the Nether, broke some Netherack, got back to the overworld and accidently touched an obsidian block of my portal with the stone pickaxe in hand and it immediately broke. It didn't drop anything but broke in milliseconds. Same thing happend some weeks ago to a block of cobblestone in the nether after breaking some netherrack.
Linked issues
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Hi Bacshau, there are several different scenarios whereby this instant or very fast break can occur. We're trying to narrow it down by relating all of those bugs. So far, we're pretty sure they're related, but we're not yet sure what's the common problem.
Are you sure this is a duplicate of #9722? I never switched between Survival and Creative. It has always been a Survival world.