Sheet background in share extension ignores Liquid Glass effect in iOS 26/Xcode 26

I’m developing a share extension for iOS 26 with Xcode 26. When the extension’s sheet appears, it always shows a full white background, even though iOS 26 introduces a new “Liquid Glass” effect for partial sheets.

Expected: The sheet background should use the iOS 26 glassmorphism effect as seen in full apps.

Actual behavior: Custom sheets in my app get the glass effect, but the native system sheet in the share extension always opens as plain white.

Steps to reproduce:

Create a share extension using UIKit

Present any UIViewController as the main view

Set modalPresentationStyle = .pageSheet (or leave as default)

Observe solid white background, not glassmorphism

Sample code:

swift override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = .clear preferredContentSize = CGSize(width: UIScreen.main.bounds.width, height: 300) } Troubleshooting attempted:

Tried adding UIVisualEffectView with system blur/materials

Removed all custom backgrounds

Set modalPresentationStyle explicitly

Questions:

Is it possible to enable or force the Liquid Glass effect in share extensions on iOS 26?

Is this a limitation by design or a potential bug?

Any workaround to make extension sheet backgrounds match system glass appearance?