Pretty simple, I was making a storage room full of drawers, went about locking them all pre-emptively and noticed one wall wouldn't show the lock symbol. After some testing I found it DOES show it, but on the side of the drawer, not the front, but ONLY when facing one direction.
Example:
https://imgur.com/a/h5c9S55

if you update the storage draws mod it should fix it did for me