When Oinchack'olp asks character "Have you find my stone?" and party does have this stone in bags, there are same variants of an answer two times - "No, i have not found it" (see screenshot)
One of those answers leads to end of dialog (menu with goodbye and ~"i have other questions" option), the other one leads to Oinchack'olp claim you are lying and asking you to give it to him (with options to give it or to say you want to keep it).
I suppose there shouldnt be option that leads to goodbye on this stage.
When Oinchack'olp asks character "Have you find my stone?" and party does have this stone in bags, there are same variants of an answer two times - "No, i have not found it" (see screenshot) One of those answers leads to end of dialog (menu with goodbye and ~"i have other questions" option), the other one leads to Oinchack'olp claim you are lying and asking you to give it to him (with options to give it or to say you want to keep it). I suppose there shouldnt be option that leads to goodbye on this stage.
Screenshot: https://imgur.com/a/cAyKvXc
Savefile (13th slot): https://disk.yandex.ru/d/K1wk2TrlvBbFFQ
EE version is 3.2.9