Chat history partial loss
On one-to-one chat, the history only loads partially.
In one case, the first screen loads the 11 or 12 last messages. Then If I scroll up, message that are 3 or 4 days older are loaded, but some messages between them are missing (the 13th, 14th, etc last messages).
Moreover, if I write a new message then reload the page, I have one more missing message in the history :
Here some messages are missing between 19:13 and 19:23. Then, if I write one more message and reload the page :
And again, some more messages disappeared :