After seeing the threads of mag drops I took my new 45 mags apart to have a look. The followers do make contact with the mag release and move it just about flush with the inside of the mag. This is my new never fired Shield so I decided to be proactive and mill a slot in the follower of just the 6 round mag so it doesn't touch the release. I left the 7 round mag alone to see if it ever has a drop issue.
I bet S&W will eventually incorporate this mod to all the mags.