Uh huh,
Now how do you guarantee that the exhaust is closed?

that was the given.

It is entirely possible for water to pass into the cylinder via an
open ex valve and then into the inlet manifold via an inlet valve that
is also open at the same time.

the given was an open exhaust valve. no open exhaust valve no water in a
cylinder.

your arguement is specious, oxxy. suitable only for a universe that only you
inhabit.