Note: I've only tried it in 1.16 and 1.8.9, does not work in 1.8.9, but not sure about other later versions.
If I remap the Attack/Destroy or Use Item button (Default left/right mouse button) to another key such as "K" or another letter, when holding the key down, it rapidly clicks at 30cps. With left click this spams a lot of hits, and right click can place blocks super fast or throw 30 snowballs per second, etc.
Linked issues
duplicates 1
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-129132, which is a report that has not been resolved yet.
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