I’ve been having this issue too. I uploaded an UGC for a client on the 11th of September. After waiting for 5 days I decided to re-upload the item. The re-upload passed moderation fast as usual, and the old upload (from the 11th) got through too, at the same time.
Of course the item got through moderation, but the re-upload was needed for it, so i ended up paying an extra fee for that.