I have the same thing happen to my Music Maker hips every year. This is the first year that I've collected and tried to germinate, so I don't know if it affects viability. I'll let you know if I get germination.

They'll be fine. They're called exogenous seeds and some roses will just do that.

Hi,

I have this problem with some of mine too.. This exposure to wint and direct sunlight sometimes kill the seeds by drying out. Now I'm doing the embryo extraction with my seeds. I've been notice that mostly of those open growing seeds have a dead embryo inside them, mostly not all. But don't give up, protect your open growing hips. If you are able to do the embryo extraction, do It. You will save your time, patience and hope.

Rodrigo