If you break the top half of double blocks (tall grass, rose bushes, doors, etc), you will notice that no breaking particles or sounds are emitted from the bottom half.
How to reproduce
/tick freeze
Place down tall grass
Break top half
/tick step 1t
Observe no breaking particles or sounds from the bottom half
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Comments 2

Thank you for your report!
We're tracking this issue in MC-164108, so this ticket is being resolved and linked as a duplicate.
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With further testing on a local server with 3 clients, it appears everyone but who broke the top half can observe breaking effects emitted from the bottom half.