14.8 security was a rush release. I would not assume it to be available on 15 beta. Anyway, if you're concerned about your data, follow Reck41 advice.

You've probably hit a system limit. But why do you need to dispatch ? Aren't you already in the main thread ?

Yes, it is possible. See what I posted before (with the screenshot).

Yes, view based is much simpler !

The detailed explanation you got in         https://stackoverflow.com/questions/69160053/why-do-animations-not-work-when-deselecting-a-uitableviewcell-in-a-uitableview-a     seems relevant: it is a question of how update events are queued in the system. And dispatch changes the way it is handled.

Yes, it is view based. Could you post the complete code of your test, so that we can reproduce ?

TableView may work even with delegate not defined. Did you set the delegate ? In addition, please show the code of IBAction. Sender must be        (_ sender: NSTextField)

TapGesture will activate when you tap anywhere in the picker, on a row which may be different from selection, isn't it ? And tapping will not change the selection. That could be misleading. Or pickerTapped must first identify which row was tapped, which is not so easy. Or limit the tap to the center of the picker which is where the selection is.

"MacCatalyst but I am aware that it's not always the most easy"     you're right, but it was designed for this exact goal. It's complex because bridging the 2 OS is not that easy. Maybe, instead of trying to adapt your code you should redesign your app with MacCatalyst. Good luck.

OK, you now use the same context.

Did you ask the question on the Swift Forum ?

For more fun, change as:     let citiesEU = ["Paris", "Toulouse", "London", "Milan", "Berlin", "Rome", "Madrid", "Lisbon", "Athens", "Brussels"]            let citiesUS = ["New York", "San Francisco", "Washington", "Dallas", "Cupertino", "Seattle", "Miami", "Chicago", "Detroit", "Phoenix"]                      class Responser: NSObject {     //Method to be called     var tag: Int = 0     @objc func printname() {         var value = "" // 0         switch tag {         case 1: value = citiesEU.randomElement() ?? "No EU city" //  (1...10).randomElement() ?? 1         case 2: value = citiesUS.randomElement() ?? "No US city" //  (11...20).randomElement() ?? 2         default: value = "No city" // 0         }         lbl.text = value // "(value)"     } }

Is it a test ? A joke ? A mistake ? A bet ? In any case, not very appropriate for the forum unless you explain your purpose. Have a good day.

I do not see the link between the screen capture and the code you post for contentView. In addition, there is no section defined in this code.

That just confirms the 2 solutions I proposed.