Issue with the "self" (uncredited) function...

I've got this issue with this episode of "A History of Alternative Comedy": https://youtu.be/xv3F_qMXnVo?si=xJGIO49lQJ3lAaR2&t=172 Jennifer Saunders appears there, but isn't credited for the third episode as she doesn't say anything. But if I put her as anything other than "self" it will cause a clash with her other, credited, appearances, which are just as "self".