Comment 14 for bug 1449685

“Most often in groups with many (500+) unread messages. The only way I managed to get them back was by clicking on a quoted message of a reply, while the quoted messages was missing, so it scrolls to a white "page" and then loads some messages near it. It happens on the iOS and the Mac client too.”
This new bug happens all the time! 2k unread messages groups looks like 300~500 unread messages when scrolling. The only way to get some messages back is to click on quoted messages, so the chat scrolls up to a blank part and download around 100 messages. Pls fix it.
Device Information: Device: iPhone8,2; iOS Version: 11.2.2 App Version: 4.7.1