There are a number of slabs that cannot be broken instantly using the same level of haste and efficiency as their block and stair counterparts. These are:
stone
sandstone
stone brick
quartz
red sandstone
blackstone
polished blackstone bricks
Linked issues
duplicates 1
Comments 3
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-53641, which is a report that has not been resolved yet.
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What level of Haste and Efficiency are you using?