It does not matter. They are different variables. They do not know about one another.
In order to Tick Print the change you made, you’d need to access the instance of the actor that changed its own struct.
Perhaps think of the struct as of a simple string. If I add 3 actor instances, each with a piece of unique text:
If I now go to the Game Mode and create another string there, it will be just an empty string unless I punch in some text or grab one of the actosr and get its unique text. Structs are no different - they are collections of basic variables.
Variables are just containers data sits in.