Read Receipts for Teams Personal and Group Chats

We're having some interesting things happening and not sure if they are by design or not. Scenario: All of us have read Receipts ON we are in an internal Group chat.

I see that my Chat has been sent via the tick Icon, The Tick icon only stays for the most recent entry. Once you have further chats or replies, the tick disappears. (Same thing happens for the eye icon in a 1:1 Chat). In the Group chat you hover over an existing chat select the ellipses then Read by... In all my cases there is only ever 1 read but 4 people are in the chat all adding content including adding a Like to my message BUT they have not been recorded in the read receipts. All of us are experiencing this. I would like to know what happens when everyone has read the chat but cannot do this. Any ideas on what we could do apart from shutting down, logging out or is this by design. I cannot find any posts or better blogs to find out this info. Its as though no one has the capability to have read receipts yet. TonyRedmond