Yeah, port injection with ethanol/methanol can lead to some fireworks. This is something that concerns me on the reflex that it doesn't have injection phase control. This can lead to a great deal of fuel in the manifold which can certainly explode when/if a backfire occurs. Examples of this are when the Honda indycars blew their plenums in the early '00s on the back straight at Indy.....they blew the engine covers off and put them into the golf course outside of the course.
One really wants well targeted injectors, lower duty cycle (say 50ish%), and MUST have phase control. Otherwise the fuel charge cannot really be tuned to enter the runner when the tuning pulse is optimally placed at the injector location at the time of injection. Bias of high/low injection and timing/tuning is a very big deal in engine development and can cause some real issues if not done properly.