The Bug:
Block cracks remain on blocks in adventure mode when losing focus of them
Steps to Reproduce:
Place a grass block and a diamond block next to one another.
Switch into adventure mode.
Give yourself a shovel that can destroy grass blocks by using the command provided below.
/give @s minecraft:wooden_shovel[can_break={blocks:"minecraft:grass_block"}]
Start breaking the grass block but quickly move your focus to the diamond block, whilst keeping the Attack/Destroy button held down.
Take note as to whether or not block cracks remain on blocks in adventure mode when losing focus of them
Observed Behavior:
Block cracks remain on blocks when losing focus of them.
Expected Behavior:
Block cracks would not remain on blocks when losing focus of them.
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Confirmed for 1.7.5, 14w08a and 14w10c
Fixed in 1.8pre2
Not completely. You can reproduce using a sword, holding as a shield (rightclicked) and trying to break a block. In survival
@unknown, that's MC-64066
Please mark this issue as resolved

Sorry for the long delay. We're not allmighty, so we cannot see everything happening on the tracker. Marked it as Fixed.

Reopened ( MC-74899)
Confirmed for 1.13.1. Also happens with Survival Mode.

Confirmed in 1.15.2 and 20w20b.

Affects 20w30a
Can confirm in 20w48a.
Confirmed in 20w46a.
Can confirm in 20w51a. I'd like to request ownership since the reporter has been inactive since February 2013.
Can confirm in 21w06a.
Video attached.
Confirmed in 13w04a.