Confirmed here too.
But...
I read somewhere that the rate of mechanical failure at the first stages of its operational introduction was quite high.
Maybe it was beta too...
This had to do much with the management of the throttle, if I remember correctly.
In the same contest, pilots who went through the E-1 & E-3 training always wanted to have the manual prop pith control option available while the new
pilots who only knew the auto rarely used the manual option.
Could be in Spitfire on my tail de Steinhilper.