This is expected. mannequines are not real users and this is just a placeholder. If you’re seeing that something is authored by mannequine, this means that the content is not claimed by the specified github user.
The corresponding GitHub user decided not to accept invitations to claim this content on github and we are not allowed to “force attribute” it.
I believe that it does remain possible for a mannequin user to accept the invitation to join the llvm-bz-contributors group, in which case they can re-associate those “mannequin” bugs with their account. (I’m not sure the full set of steps that needs to be taken for this to occur, however).
User should accept / request an invitation to llvm-bz-contributors group (this is how a user starts belonging to llvm organization). No association happens here.
Only then I can be able to send an attribution invitation for such user to claim a mannequin. A user should accept such invitation. There is no way to request it.
All invitations to llvm-bz-contributors were already sent. If someone would want to claim the ownership, then they could just ask.