Structural search and generic types

I'm trying to find instances of Map.get() where the argument is a string instead of the expected object type. Trivial example code:

import java.util.HashMap;
import java.util.Map;

public class Main {
  public static void main(String[] args) {
    Map<Example, String> testMap = new HashMap<>();
    testMap.put(new Example(), "something");
    String value = testMap.get("a string");
  }
}

class Example {}

The testMap.get() call is what I want to match.

I try a structured search for a simple expression, just "$expr$" (minus the double quotes). In the variables dialog I set the expression type to String and the expected type to Example. I would have expected it to find the parameter of the get() call but it comes up empty.

However, if I change it to this:

public class Main {
  public static void main(String[] args) {
    doSomething("foo");
  }
  
  private static void doSomething(Example obj) {}
}

class Example {}

The search succeeds and finds "foo". So clearly it's able to match method arguments.

Does the "expected type" feature of structural search not pay attention to generics? Or am I fundamentally misunderstanding something?