Invite - Delegate option sends a notification email with wrong account photo

1. Have 3 users with different photo / pictures associated with.

2. User1 creates an appointment with user2 included. In Send Options tab -> Status Tracking he specifies to send a notification mail when appointment is accepted and also when declined.

3. User2 opens the appointment -> goes int Invite and chooses Delegate & Delete option and delegates user3.

4. User3 accepts the appointment.

5. In user1 mailbox there is now a notification mail from users about declining appointment with a correct photo. 

Other notification mail is sent from user3 about accepting it -> that mail has correct sender "user3" but photo is incorrect, it is one of "user2".

We use a picture of a user who delegated the appointment.