Im having this problem with one of my symbols, I have this button that when I convert it to a persistent symbol and it adds it to every scene the pin and sizing resets to only up and and left, when the original has the four of them.
The “inner” contents of a persistent symbol (or symbol) will be the same on every scene. The “outer” element properties are per-scene though - there could be situations where you’d want the placement or flexible layout options to be different on different scenes. So you’ll need to adjust this across all scenes and layouts.