…9#3151)

Among three call sites of IsCompatiblePropertyDescriptor, one in
[[GetOwnProperty]] internal method of a Proxy exotic object(step 14 with respect to es2023)
it is possible that argument `targetDesc` is *undefined*. For example,
in the below javascript code,

```javascript
const monster1 = {
    eyeCount: 4,
};
const handler1 = {
    getOwnPropertyDescriptor(target, prop) {
        return { enumerable: true, configurable: true, value: "I'm a descriptor!" }
    },
};

const proxy1 = new Proxy(monster1, handler1);
proxy1.hasOwnProperty("noseCount"); // true
```

`targetDesc` is undefined as `monster1` does not have `noseCount` property.