Hi Ziqiao, Sorry for the late reply! We really appreciate you taking the time to write out these troubleshooting steps. I just wanted to drop a quick follow-up. We ran tests on devices running iOS 26.4.1 and everything works perfectly now—the alert pops up in Traditional Chinese as expected. Since we haven't touched any of our localization setups or the .lproj directories, we assume this might have been a minor system bug in earlier iOS versions that your team has already squashed in the recent releases. Really appreciate your guidance on this. Have a great day! Thank you !