Hidden media is not masked on lock screen

[ufoproger]

Checklist

• [x] I am reporting an issue in existing functionality that does not work as intended
• [x] I've searched for existing GitHub issues

Description

Hidden media was shown on lock screen in message preview.

Expected Behavior

Hidden media really hidden (masked).

Actual Behavior

Hidden media shows as-is (not masked).

Steps to Reproduce

1. Lock device.
2. Receive message with hidden media (image).
3. Look at unhidden media (image) without user interaction.

Screenshots and Videos

Environment

Device: iPhone 13

iOS version: 16.2

App version: 9.4.2