(Singleplayer) When breaking blocks very quickly, e.g. with an Efficiency V Diamond Pickaxe on Netherrack, occasionally the block will not update properly. It appears invisible, but does not allow the player to move through it, and cannot be broken. Upon reloading the world, the block reappears, and can now be broken.
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violine1101
migrated
Thank you for your report!
We're actually already tracking this issue in MC-156852, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. Depending on the resolution, that can mean that it either will be fixed in the next version, or that it is not considered a bug and won't be fixed.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.