You can no longer use control + click to act as right-click on a Mac in 1.13 snapshots, starting with 17w43a. This means that MacBook users that play with a trackpad will now need a mouse for playing comfortably.
Environment
MacBook Pro 17-inch Mid 2010 macOS 10.13.3 Java 9.0.4
Please do not mark unreleased versions as affected.
You don't have access to them yet.