We noticed that, when we use different whatsapp number send to the same contact, we can not differentiate easily the message is sent from which number, we have to hover on the message and click details, then we know, sine we have the information it is from which number, can we use the first digit and the last digit to show on the Chat icon? Where currently it is showing as a ?, ? will be shown if it is sent via Whatsapp Template/Flow, or from WhatsApp App.
It is another differentiation mechanism besides the user differentiation, this is for Template message and message sent from Whatsapp App.
Please take note the screenshots I sent in are the conversations for the same contacts from 2 different whatsapp numbers.