Sad news - it might be impossible to implement avatars for group chats.
Strange. If I’m able to manually set an avatar for the group contact entry AND group avatar could be retrieved in previous versions of the plugin, why it’s not possible to do both things now?
I notice that my nickname is shown with the same color than the other nicks, while at Customize - Fonts and Colors - Message Sessions - Group chats - Your nickname has a distinct color. Also, my messages are >> (incoming) instead of << (outgoing).
On the other hand, one thing that could be improved is the behaviour when I copy-paste a link from one group/chat to another whatsapp contact or group. When I do this, others keep receiving a link instead of the normal thumbnail, etc. There has to be some kind of extra metadata that I cannot replicate in order to appear as a "normal" whatsapp user.