All my JavaFX apps don't run anymore with JavaFX 16-ea+7 when started like this:
class MyAppLauncher {public static void main(String[] args) {MyApp.main(args);}}
where MyApp extends Application. This avoids using the JPMS and has worked always up to now.

All I get is this warning: 2021-02-12 18:30:31 [WARNING][com.sun.javafx.application.PlatformImpl startup] Unsupported JavaFX configuration: classes were loaded from 'unnamed module @2c4231'

and then there is silence. The app just hangs and does not show any GUI.
I know that such a warning was going to be introduced but up to now my understanding was that this is just that - a warning.

This was tested on macOS 10.15.7 starting several apps from within Eclipse and as a standalone packaged application.