I request this not to be fixed as it is great for mob farms as you dont have to sort out bows and other equipment drops. This only has a noticeable negative effect for drowned farms and for most cases using an autoclicker or just manually killing them is fine.
While this would be a nice parity feature it is still possible to make concrete converters and tree farms using ghasts it withers.
This should not be fixed as it is helpful and would be a nice feature that should be added to both versions of the game. It's not overpowered as curing a nitwit still takes longer and more resources than breeding a new one.
This is also disparity with java edition as on java edition and on the full release of bedrock edition sugarcane bamboo cactus all break one block at a time but in the1.16.100.53 beta it breaks instantly.
This can be reproduced by towering up with sugarcane bamboo or cactus and breaking the bottom plant on java the bedrock beta and the bedrock full release,
Expected result
On all 3 versions of the game it should break 1 block at a time every gametick.
Actual result
The result described in expected result is the case for java and the bedrock full release but not for the beta. In the beta it breaks all at once