Expected behavior
The Invitebot collects the avatars of the group members and transmits them to new members when adding them. At the same time, he sends the avatar of a new member to the others.
Actual behavior
The invitebot does not collect avatars.
Explanation
The invitebot is part of a group and therefore receives all messages including the avatars of the members. These can only be seen by the others if the corresponding member has written something. Unless the users have already been in contact via DC. But especially in large groups this is often not the case and it can take a while until all members can see the avatars of everyone else.
I think it would be useful if the invitebot would transmit the collected avatars to new members when adding and at the same time the avatars of the new ones to the other group members.