I found this thread recently when searching about slide stop issues.
A friend's Shield from 2017 had this spring problem that bound up his slide.
My new Shield Plus came with a slide stop spring sticking out half way, so this issue remains even today. I tapped the spring in below flush after addressing other issues with the spring.
I think Shields are decent pistols, but nothing is perfect. All guns have quirks. It's good to learn about and pay attention to the known weaknesses of one's firearms, particularly those intended to be used for defensive purposes.
The attached pictures show how my Shield Plus' slide stop spring came from the factory and how deeply it can and should be seated. You don't need tools to examine yours. Just take a look at the spring.
You don't have to remove the trigger block to seat the spring deeper. My 2017 vintage "1.0" Shield's spring was also sitting a little proud when I examined it today. I hadn't paid any attention to it before. The side is shiny from wear. I tapped it in to a little below flush using a small punch without disassembling anything. Even though my 1/16"ish punch doesn't fit down into the slot, angling the punch allowed setting the spring deeper. Only very light taps are required.
Is the slide stop spring not being seated properly a problem? It sure can be. It is an easy thing to check and resolve. I thank the OP for describing this issue.