I don't know how I can explain this so I will just say how you make this bug happen:

1- Change your game mode to adventure mode (2)

2- Find tons of tall grass on an area

3- Break one of them and hold the break button(Left Mouse Click).

4- And then break other tall grass while you have that button pressed

You will notice that breaking animation does not reactivate when you do this.

It is a minor bug, but it is still a bug to report