iOS 26 Beta breaks scroll/gesture in SwiftUI chat (worked in iOS 18): Simultaneous gestures & ScrollViewReader issues

Hi all,

After upgrading to the iOS 26 beta, the scrolling in my SwiftUI chat view is completely broken. The exact same code works perfectly on iOS 18.

Context: I have a chat view using ScrollViewReader and a vertically-reversed ScrollView (with .rotationEffect(.degrees(180))). Each message row (MessageBubble) uses multiple simultaneousGesture handlers:

• Horizontal drag for swipe-to-reply (and other actions: pin, delete)
• Long press for showing popover/actions
• Vertical scroll for normal chat scrolling

This was working great on iOS 18. In iOS 26 beta, the vertical scroll is either completely disabled, jittery, or hijacked by the message row’s drag gestures, even though .simultaneousGesture is used (see code below).

Minimal Repro Sample

MessageListView.swift

swift Copy Edit

ScrollViewReader { proxy in
    ScrollView(.vertical, showsIndicators: false) {
        LazyVStack(spacing: 0) {
            // ... grouped messages
            ForEach(...) { ... 
                MessageBubble(...) // see below
            }
            Color.clear.frame(height: 8).id("BOTTOM_ANCHOR")
        }
        .padding(.horizontal, 4)
        .rotationEffect(.degrees(180))
    }
    .rotationEffect(.degrees(180))
}

MessageBubble.swift

struct MessageBubble: View {
    // ...
    var body: some View {
        // horizontal swipe-to-reply gesture
        let dragGesture = DragGesture(minimumDistance: 10)
            // ...
        ZStack {
            // ...
            HStack { ... }
                // ...
                .simultaneousGesture(
                    DragGesture(minimumDistance: 0) // for long press
                        // ...
                )
                .simultaneousGesture(dragGesture) // for horizontal swipe
        }
        // ...
    }
}