Watching an interesting video of old style sand green where you have to putt on
Made me think that this "green" are the same as some of the so called "greenside sand traps" some muni course have. It has hardly any sand and is not deep. For these" so called traps" conventional teaching of hitting sand with the ball will not work. There isn't enough sand underneath the ball.I think think the sand wedge will just hit the ground. The best way to get out of these would be to putt or a "picking" type of chip shot.