I'm using the beta test software 1.47-beta6 with Arduino 1.8.7 on macOS 10.14.6

When I compiled the Blinky sketch and it uploads to T4 ok, but it does not do auto reboot like the T3.2. I have to unplug and replug the USB in order to use the new sketch.

Yes, I did press the button on board for the first time. It say "Reboot OK" but it does not reboot.

Put a T3.2 in and it auto reboot fine.

Any idea why T4 does not auto reboot after a sketch upload?