In the first bug, if you're talking with someone that is on the same chat that you are, and that person go to another chat, pc you and message you, his pawn and name will disappear within a few seconds. Sometimes it takes a few seconds, sometimes it takes more.
Seems like if the other person still have the private chat open with the messages they've exchanged with you and you refresh your chat, pawn and name will still disappear within a few seconds. Maybe if that person tickles you after you refresh the chat it might trigger this error as well.
In the second bug, if you click on the name of someone who's not in the same chat you are, his pawn will disappear from the chat box.
* Step 1: Talk with someone, or a friend that is on the same chat you are.
* Step 2: Ask this person to go to another chat, pc you and message you.
* Step 1: Go to your friend list.
* Step 2: Click on the name of someone who's not in the same chat you are.
Bug 2: https://i.imgur.com/B8HHfIX.gif