I once made rosehip wine but although it was quite tasty, I had to chuck it out as it was giving me a bad throat!
Do you remember when you were kids taking out the seeds and dropping them down your mates shirt collar as itching powder?
.............well those same fir covered seeds allow that same itching powder to get into the wine. Even though it was well 'racked', microscopic quantities in wine affected my throat and gave me a hiccy cough!
I suppose it would have been ok if I had de-seeded the hips!