Chat doesn't display content when opened in "hide UI mode"

How to reproduce : 

• Open a singleplayer world
• Send a message in the chat
• Hide UI (default key is F1)
• Open the chat 
  •  No content is display in the chat

If you send message in "hide UI mode", you see also nothing appear in the chat before you display the UI.
You can also take screenshot in "hide UI mode" and you will see nothing in the chat.