no, I use fresh phplist installation with database converted at upgrade from v2.19
What header are you looking for? Where should I search for them?
I copied in my previous message full header with part of the body for a bounce (without message itself). All technical info is there.
Moreover, for most bounces the info about why the message was rejected and what is concerned user email is in the first lines of the bounce body (not its header), but the body is not loading to phplist.