The interesting thing about the F35B STOVL is that it has an auto-eject capability enabled for the Mk 16 bang seat. If the lift fan starts to wind down, that is running from the rotation of the main engine, then the aircraft will quickly pitch about its axis - so there are certain parameters that will fire the seat automatically.
A unique feature of the US16E is the trio of airbags that inflate in a two-stage process to protect the head and neck of the F-35 pilot, wearing the large helmet-mounted display, upon ejection. Also of note, the F-35B version of the Lightning II has an auto-eject mode. This is designed to function in the specific instance where the STOVL aircraft is in the hover, and the shaft-driven lift fan fails.
In that case, the jet is likely to pitch down sharply, quicker than the pilot can react to fire the seat manually. It will therefore fire automatically while the possibility of escape remains.
I do hope that this system didn’t throw out the WAFU Pilot and throw away an otherwise perfectly serviceable jet?