How to recreate this: Go to a tree and break out two blocks. Go in that two block gap and look straight up. Start mining the log above you and move around slightly as it helps to have it appear more consistently. Don't crouch as it doesn't appear like that for some reason.
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I used bug MC-69865 so that I wouldn't have the block particles in the way. If you want I could record a video with the particles.
How did you get the breaking animation to appear without breaking the block?