After further investigation, this problem appears to be happening in iOS26.0 and fixed in the next version iOS26.1 as seen in github ShareExtensions using SLComposeServiceViewController built with Xcode 26.1 would keep crashing on iOS26.0 ShareExtensions using SLComposeServiceViewController build with Xcode 26.0 seems to work on iOS26.1

Hi! I have exactly the same problem. I could reproduce with the following steps: Create a new multi platform app In the application, add a "share extension" target (click + and search for share extension) select the share ext target and run on a simulator chose the photo app to run and test the share button pick a photo and share with the extension the extension crashes and a backtrace is shown with this message. SDK versions DriverKit SDKs: DriverKit 25.0 -sdk driverkit25.0 iOS SDKs: iOS 26.0 -sdk iphoneos26.0 iOS Simulator SDKs: Simulator - iOS 26.0 -sdk iphonesimulator26.0 macOS SDKs: macOS 26.0 -sdk macosx26.0 macOS 26.0 -sdk macosx26.0 tvOS SDKs: tvOS 26.0 -sdk appletvos26.0 tvOS Simulator SDKs: Simulator - tvOS 26.0 -sdk appletvsimulator26.0 visionOS SDKs: visionOS 26.0 -sdk xros26.0 visionOS Simulator SDKs: Simulator - visionOS 26.0 -sdk xrsimulator26.0 watchOS SDKs: watchOS 26.0 -sdk watchos26.0 watchOS Simulator SDKs: Simulator - watchOS 26.0 -sdk watchsimulator26.0 I can share a link to a zip of the project and a step recording if needed, but the forum won't allow me to share a zip.