[iOS 18] Animation frame not visible when paused at marker with alert overlay

[ABashkirova]

Description

When trying to pause Lottie animation at specific marker ("30%") and showing an alert overlay on iOS 18, the animation frame is not visible during the alert presentation. After dismissing the alert, the animation continues playing as expected.

Environment

• Lottie version: 4.5.0-4.5.1
• iOS version: 18
• Installation method: SPM

Steps to Reproduce

lottie.json

1. Create LottieAnimationView with animation that has "30%" marker
2. Play animation from "0%" to "30%" marker
3. At "30%" marker show UIAlertController
4. Expected: animation should be paused and show frame at "30%" marker
5. Actual: frame is not visible during alert presentation

private func startAnimation(mode: AnimatedMode) {
    animationView.play(
        fromMarker: mode.fromMarker,
        toMarker: mode.toMarker,
        playEndMarkerFrame: false
    )
}

enum AnimatedMode {
    case playFromStartTo30Percent
    case playFrom30to100Percent
}

private extension AnimatedMode {
    var fromMarker: String {
        switch self {
        case .playFromStartTo30Percent: "0%"
        case .playFrom30to100Percent: "30%"
        }
    }
    
    var toMarker: String {
        switch self {
        case .playFromStartTo30Percent: "30%"
        case .playFrom30to100Percent: "100%"
        }
    }
}

Additional Information

• Issue occurs only on iOS 18
• Previous iOS versions work correctly
• Tried different rendering engines
• Tried adding delays and different backgroundBehavior settings
• Animation works correctly without alert overlay

Attachments

Current behaviour for iOS 18+
Current behaviour for iOS 18+ with DispatchQueue.main.async
Works correctly on iOS 15 Video