Using Rimworld Ideology and the preceipt Slavery set to either Honored, Disapproved or Horribble.
No mods used.
If I sell a prisoner into slavery (via trade ship or friendly caravan), it doesn't give my colonist the mood thought "sold someone into slavery".
My colonist only get that mood thought if I sell a slave.
(This is caused by the function GuestUtility.IsSellingToSlavery called by Tradeable_Pawn.ResolveTrade_Patch).
Sincerely
A friendly piece of wood
Thanks for the bug report I've been able to reproduce this. I'll get it written up for the devs!