If you spam left click with a Netherite pickaxe with Efficiency 5, you can mine faster than holding down left click. The ideal click speed to get this to work is about 7-9 clicks per second.
There is a video showing the bug in more detail.
Linked issues
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Comments 3
Relates to MCPE-45619.
Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MCPE-128863, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Can comfirm.