Swift PropertyWrapper for waiting on a value to set for the first time not working - swift

Question

I intend to wait for the value is set for the first time and then the get method should return. But I am getting wrong result on the first time. Here is the code
import Foundation
import OSLog
#propertyWrapper
struct WaitTillSet<T> {
private var value: T
private let group: DispatchGroup
init(wrappedValue value: T) {
self.group = DispatchGroup()
self.value = value
group.enter()
}
var wrappedValue: T {
get { getValue() }
set { setValue(newValue: newValue) }
}
mutating func setValue(newValue: T) {
value = newValue
group.leave()
}
func getValue() -> T {
group.wait()
return value
}
}
let logger = Logger()
func testFunc() {
#WaitTillSet var data = 0
DispatchQueue.global(qos: .default).asyncAfter(deadline: .now() + 2) {
logger.info("Setting value to 10")
data = 10
}
logger.info("data = \(data)")
logger.info("dataAgain = \(data)")
}
testFunc()
And here is the output
2022-08-23 10:57:39.867967-0700 Test[68117:4747009] Setting value to 10
2022-08-23 10:57:39.868923-0700 Test[68117:4746644] data = 0
2022-08-23 10:57:39.869045-0700 Test[68117:4746644] dataAgain = 10
Program ended with exit code: 0
I also tried DispatchSemaphore. That gives the same result. Instead of propertyWrapper if I use class in the similar way I see the same problem. There is something fundamentally wrong with this.