Can confirm you can get the Nidhogg Scale/Goddess Bead back when using Reuse on Seeing Horde/Goddess weapons. Generally Reuse seems to return the first material on the craft list, so unsure why it's different here, but it works.

I'm also unsure the proc rate for Reuse is even 20%. It's been up and down, we'll need a much larger sample size to be sure of it.