When you execute the following steps with the folder feature, you permanently lose your chat:
1) Create a folder, then add any chat to it.
2) Archive the chat within the folder.
The chat normally appears in Archive.
3) The folder will appear empty no matter how many times you refresh.
4) Delete the folder, and you have now just lost your chat.
There is some sort of binding that does not come undone when a chat is sent to Archive, which causes folder deletion to also delete the chat within Archive, even though it shows that the folder does not contain the chat.
I have lost critical chats like this, and I would like to retrieve all of them because if not, then this entire service is now useless to me.