One of those little boulders that don't seem like they aught to be particularly hard. I bet lots of people got on this line (and its variants) expecting an easy flash. Such is Font that things don't always go like you expect.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.