Conversation History - Date issue

Not sure if this is a bug - I’ve noticed that if I open a chat window with a contact that has previous conversation history, the new chat is just tagged along under the history without adding today’s date. So it all looks like an extension of the previous chat. At some point the date is than applied, I think perhaps when the chat window is closed and then subsequently re-opened, but it could be a time elapsed thing - I’m not sure. I’m using Spark 2.6.0 Beta 2.