Hello. I had a new roof out on this week. After a day of tear off, they put a synthetic paper and left it over night. They shingled the next day. Somewhere in there, a 2-foot long stain on the bedroom ceiling occurred, the ceiling just below the attic. We have 12-15” of blown in insulation up there. I went up to the attic but there is no leak or water damage from the roof, and I didn’t see any water damage on the drywall either. Anyone know what could have happened here? Is this a moisture thing?