Hello Kostya,
I found this issue, I have seen it 3 or 4 times previously.
If I am looking for a message from the list, it is not shown, but if I use the search function, it appears.
The list of messages are jumping from the 7:36am to 11:01am, between this 2 messages I found the message that was looking for, the second pic is showing that message at 9:33am (it is the first one of the second pic).
Regards.