I have my WhatsApp contacts that appear in my friends list with their name, but if a contact from my friends list writes to me, a new chat appears with a different ID, even though I already have an open conversation with that friend, because I wrote to them first.
For example, I have a friend on the list with the name "Jose" and identification "[email protected]"
But when he writes to me, a chat appears with the identification "263646785581111@lid"