Component used: Navigation
Version used: alpha11
Devices/Android versions reproduced on: Android Studio 3.4 beta 2

I found a strange case, this morning, when I was trying to integrate the new alpha11 build into a project. I've replicated a minimal test case into a project and have replicated the situation.

What I see:

During build:

/Users/nealsanche/robots/Alpha11GlobalBug/app/build/generated/source/navigation-args/debug/com/robotsandpencils/testapp/tab1/Tab1FragmentDirections.java:10: error: cannot find symbol
public static com.robotsandpencils.testapp.Tab1FragmentDirections.com.robotsandpencils.testapp.NavGraphDirections.ActionGlobalGlobalFragment actionGlobalGlobalFragment() {
^
symbol: class com
location: class Tab1FragmentDirections
/Users/nealsanche/robots/Alpha11GlobalBug/app/build/generated/source/navigation-args/debug/com/robotsandpencils/testapp/tab2/Tab2FragmentDirections.java:26: error: cannot find symbol
public static com.robotsandpencils.testapp.Tab2FragmentDirections.com.robotsandpencils.testapp.NavGraphDirections.ActionGlobalGlobalFragment actionGlobalGlobalFragment() {
^
symbol: class com
location: class Tab2FragmentDirections
/Users/nealsanche/robots/Alpha11GlobalBug/app/build/generated/source/navigation-args/debug/com/robotsandpencils/testapp/tab3/Tab3FragmentDirections.java:26: error: cannot find symbol
public static com.robotsandpencils.testapp.Tab3FragmentDirections.com.robotsandpencils.testapp.NavGraphDirections.ActionGlobalGlobalFragment actionGlobalGlobalFragment() {
^
symbol: class com
location: class Tab3FragmentDirections
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
3 errors

FAILURE: Build failed with an exception.

All I did was right click on the GlobalFragment and generated a 'global' action from the menu.