Chaps
There has been a lot of emphasis here on ball in the middle so lateral stability does not affect the trim condition of the ailerons.
I fear that is a rather simplistic view of lateral stability. Other aircraft design factors beyond dihedral affect lateral stability. One that will affect many light aircraft is the height of the cg (not just its fore/aft position). If the wing is above the cg then that will produce a rolling moment when there is bank on. (think pendulum effect).
However, all this talk of tiny effects one way or the other is swamped by the swirling airflow that the airframe is immersed in with a traditional prop on the front.
It is my experience that a lot of SEP aircraft do roll out of the turn if stalled in the turn. But there are no golden rules re stalling and spinning and much is type and power dependant. THAT IS THE IMPORTANT THING FOR A PILOT TO REMEMBER. Not why it is so.
JF