The control right click used to be the default right click for Mac users in the past versions (although it always displayed it as right click in the controls menu). Now in the 1.13 snapshots (like 18w19b) when we Mac users try to control right click, the game considers it as the attack/break action. We also, cannot set the right click to control right click in the controls menu for some reason (I think its because we can't set two keys for one action).
This bug is still going on in 18w22c