I have missed a problem with the Java Generic type

public class MyTest {
    @Test
    public void test1() throws Exception {
        List<Integer> list = getMapInstance();
    }

    public static <T extends Map<Object, Object>> T getMapInstance() {
        T t = (T) new HashMap<>();
        return t;
    }
}

In the code, I assign a T (which extends Map<Object, Object>) to a List, I think it will be intercepted by compile-time type checking. but it successfully complied and when I run it, it throws a ClassCastException

//the bytecode of test1  
0 invokestatic #10 <org/example/BugTest.getMapInstance : ()Ljava/util/Map;>
3 checkcast #11 <java/util/List>
6 astore_1
7 return

My JDK version is 11 and 17

I want to know why this code compiles successfully, please