Over two months on and, sadly, 9.547.0 (beta) does not fix the issue for me.
- Configure Amigo to start in overlay mode and start when connected to the car's Bluetooth
- Turn on the car's Bluetooth - Amigo starts in overlay mode as expected, but does not update the speed limit as I drive from one speed limit to the next
- Tap the overlay and select Fullscreen - Amigo goes to Fullscreen/map mode as expected
- Wait until the speed limit (lower left) updates
- Tap the speed limit (lower left) and Amigo returns to overlay mode, as expected
- Now, in overlay mode, the speed limits are updated