WebEngineView crash in custom Boot2Qt image for RPI3B

I built a custom Boot2Qt image (5.11.2) for the Raspberry Pi 3B following the guide at url

http://doc.qt.io/QtForDeviceCreation/qtee-custom-embedded-linux-image.html

I wrote a simple QML application with a WebEngineView but crash at startup:

Sandboxing disabled by user.

Received signal 11 SEGV_ACCERR 000076ec2000

#0 0x00007268f4da <unknown>

#1 0x00007338d346 <unknown>

#2 0x000075c3e330

<unknown>

[end of stack trace]

Calling _exit(1). Core file will not be generated.

Using the standard image for the Raspberry (QtCreator - Tools - Flash Boot to Qt to device) everything works properly.

I tried also the WebBrowser demo application in Qt Launcher with same results.