When you are breaking a bunch of blocks and start breaking a next block while still breaking, that next block doesn't start breaking for about 1-2 seconds.

What I expected to happen was:
For the next block to start breaking immediately.

What actually happened was:
The next block wasn't breaking at all, The breaking froze for a while then resumed. This bug happens sometimes.

Steps to Reproduce:
1. Place a bunch or a pile of blocks.
2. Break every single blocks without letting go (you can just do this until you see the bug)
3. There will be a delay before the next block starts to break

(IN THE ATTACHMENT, IT SHOWS HOW IT LOOKS LIKE WHEN THE NEXT BLOCK IS BEING BROKEN BUT IT JUST STAYS FROZEN LIKE THAT FOR A WHILE)