`in` operator not working correctly when using Proxy as VM context

• Version: v12.13.1
• Platform: Windows 10

The in operator does not work correctly when using a Proxy as a VM context.

var o = {};
var p = new Proxy(o, {
    has(target, key) {
        console.log('has', key);
        return Reflect.has(target, key);
    },
    get(target, key, receiver) {
        console.log('get', key);
        return Reflect.get(target, key, receiver);
    },
});
vm.createContext(p);
vm.runInContext(`this.abcInThis = 'abc' in this`, p);
console.log(JSON.stringify(o)); // Prints {"abcInThis":false}

In the above code, the expected output is:

has abc
{"abcInThis":false}

but the actual output is:

get abc
{"abcInThis":true}

If we remove the get(target, key, receiver) function, the still incorrect output is:

{"abcInThis":false}

Start by reproducing the provided Proxy example through vm.createContext and vm.runInContext, then read the VM context implementation and its handling of property checks and access. Done means the in operator invokes the Proxy's has trap and the observed output matches the expected behavior, with regression coverage for the example.