I haven't had a chance to test myself, but heard from a user that this issue is back in 26.4 beta if anyone is able to confirm.

We're experiencing this in our app as well, macOS 26.3 RC has completely broken the interaction of being able to click through transparent areas of a borderless window that worked in all prior macOS versions.

This app is currently in beta through TestFlight, but will be distributed through the App Store on both platforms.

I'm having this issue as well and not sure how to move forward. The app works on macOS 14 fine, on macOS 15 my testers are getting: This is a multi-platform SwiftUI based app that I plan on supporting iOS 17/18 and macOS 14/15. They both need shared app group containers to function. How do I configure this correctly in Xcode? Thanks! – Zach