In Conversation mode, senders and recipients are the wrong way around in order of display.
I.e., if someone sends me an e-mail, and I respond to them, it incorrectly puts them as the first sender name in the list and displays their avatar in the message list.
Likewise, if I send someone an e-mail and they respond, it puts my name first and displays my avatar.
This is the wrong way around, as you want to see who sent the last e-mail.
I.e., you would always want it to display the avatar of the last person who sent the message, and their name should be first in the list of names in the “From” field.
Version 9.2.2038 (c8b8173) (Windows)