The Altitude select on the FCU scrolled fast to 1000 ft and aircraft started to dive - No way to move the altitude back to 5000 ft nor level the aircraft.
As I was on the glide slope, I engaged the APPR, but did not respond to the approach mode.
I had to fly the landing phase manually.
I’m using the A32NX v0.4.1 stable release btw.
The fault did not come back on another test flight.