Might be a bug or maybe an oversight, but I think extra planar potential shard are not dropping in Laurion's Song at all. And Im not 100% sure they dropped in Night of Shadows either.
I think there's already another thread on this somewhere. They definitely dropped in NoS because I got a few.
Hope the sellers on Tunare enjoyed the prices I've been paying for these, cuz if they're dropping again, I'm dropping prices! Conq