Found the issue. This issue was nothing to do with differable datasource. public override func layoutSubviews() { super.layoutSubviews() render() } render function here changes UILayoutContraints that induces another layoutSubviews call. This was working fine in Sequoia.

Cool! Confirmed both suggestions work. Archive Set run destination to "Any Mac". Thank you both!

Hello, Quinn. Thanks for taking a look. At the end, this issue was resolved as below: Looks like, following command doesn't prompt a permission. ./ScreenStreamTest But this does. open -n ScreenStreamTest

I also had the same issue. Some observations: When I added the dummy tabbar item (so that there are 5 tabbar items) then it seems fine. The number of tabbar item didn't change to 6. I moved the populating viewControllers array logic to viewDidAppear, it seems working alright. (previously it was it viewDidLoad).