non-`Sendable` cannot cross actor boundary

non-Sendable-actor-boundary.swift

public actor A {
    nonisolated let mySendable: MySendable
    nonisolated let nonSendable: NonSendable

    public init() {
        self.mySendable = MySendable()
        self.nonSendable = NonSendable()
    }

    public nonisolated var forwardedMySendable: MySendable {
        self.mySendable
    }

    // Warning: Non-sendable type 'NonSendable' in asynchronous access to nonisolated property 'nonSendable' cannot cross actor boundary
    public nonisolated var forwardedNonSendable: NonSendable {
        self.nonSendable
    }
}

public struct MySendable: Sendable {
    public init() {}
}

public struct NonSendable {
    public init() {}
}