I hate how you never get anything back from Glyphs.
It's a way worse return rate than blacksmithing, enchanting of woodworking.
I have never extracted vendor purchased runes, perhaps those have different extraction rules.
Also, I thought the Extraction Passive was mainly to increase the chance for Aspects, not the Potency or Essence, but maybe it is.
Before 1.5 I always got a Potency and an Essence, but rarely an Aspect. I was even down on Ta's if you can believe that. Since the changes, some with 1.5, some with a later change, I now have over a 600 of these things and I can't give them away.
I just deconstructed 15 white glyphs and I got nothing. My Runestone Extraction is 3/3. I think it is bugged. I don't recall it this bad where I would get nothing. I did get a few items from my green glyphs.