Some WhatsApp notifications doesn't have contact icons

NiLS displays the notification icons as they retrieved from Android notifications system.

WhatsApp application provides a contact icon only if there are multiple unread notifications from the same contact or the same group. 

• If you'll have multiple unread messages from the same contact - you'll see the contact icon.
• If you'll have multiple unread messages from the same group - you'll see the group icon.
• If you'll have multiple unread messages from several groups and contacts - you'll see the WhatsApp icon.

This is not something that NiLS can change and only WhatsApp controls which icons appear in the notifications.

Unfortunately the only workaround is to open once in a while WhatsApp and mark all conversation as read, so next notifications will have the contact icon.