is duplicated by:

• SR-10338 Swift 5 regression: initializing NSObject returns wrong instance
• SR-10457 Xcode 10.2/Swift 5.0 init() behavior change => Unexpected type initialized at runtime.
• SR-10558 Failed to cast to a concrete class type after sequence's init(elements: Sequence)
• SR-10617 polymorphism breaks when a generic instantiates its protocol-constrained parameterized type
• SR-10849 (fixed in Xcode 11) Type metadata dispatches to wrong init
• SR-10958 Swift 5 regression with init delegation
• SR-11416 Protocol behavior in Swift 5, regression?

Issue Description:

Hi, I have this following code

import Foundation

protocol MyProtocol {
    init()
}

@objc(ClassA)
class ClassA: NSObject, MyProtocol {
    
    override required init() {
        super.init()
    }
}

@objc(ClassB)
class ClassB: ClassA {

}

private func myMethod(name: String) -> MyProtocol {
    guard let klass = NSClassFromString(name) as? MyProtocol.Type else {
        fatalError()
    }
    return klass.init()
}

let myClass = myMethod(name: "ClassB")

print(myClass)

The result of myMethod is an instance of ClassA and not ClassB as expected. This code worked compiled with Xcode 10.1, but now it doesn't. Any advice? Thanks