Type.GetInterfaces返回值与CLR不一致

[man75319]

interface IA
{

}

class A : IA
{

}

class B : A
{

}

static void TestGetInterfaces()
{
var type = typeof(B);
Debug.Log($"TypeB's interface count : {type.GetInterfaces().Length}"); //Output -> CLR:1, ILR:0
}

type.GetInterfaces().Length期望返回1（即IA），实际返回0

Unity Version
2020.3.36f1

ILRuntime Version
2.0.2