If you place torch under yourself and quickly break the torch (mainhand was empty) the "cracks" appear on it and save untill you start breaking any block. Consatntly doing this can lead to the block to be broken. I think it works with almost every block that can be instantly destroyed in survival/hardcore mode, but I've only tried with the torch.
P.S. I used OptiFine 1.15.2 pre 9
P.P.S. Launched and did same in vanilla the glitch works.
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This issue has been closed as invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
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I have the same issue in a microfarm where I press left and right mouse button continously - left to break crops, right to place new ones which are then bonemealed by dispensers. The block behind the crops gets destroyed after a while (you can see the damage accumulating over time), only when I release the left mouse button every once in a while and allow the right click to hit the block behind, it becomes undamaged. Realms world in vanilla 1.15.2.
Thank you for your report!
We're actually already tracking this issue in MC-157404, so I resolved and linked this ticket as a duplicate.
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I started placing and breaking torch in rhythm of the music and found that out