When initially hitting or activating a Noteblock, the note particle will sometimes render in the incorrect place for a couple frames before jumping to where it's suppose to be. The particle always seems to appear about 2 blocks North of the Noteblock instead of 1 block up.

It doesn't happen extremely often, only when the server side (even Single Player servers) slows down a bit I believe.

To reproduce, generate a bunch of server lag (i.e. rapid firing Command Blocks, something that doesn't lag the client itself), and hit/tune a noteblock. You should see the particle North of the block for a frame or two.

May be related to MC-12269