I remember running into a Scriptorium that offered to trade me a Ridinghall lvl1 blueprint.

I already had a Riding hall lvl1 blueprint in my inventory, so I thought, swapping a lvl1 for a lvl1 wouldn't hurt. So I swapped them. XD

---

Couple of hours later, after buying a different blueprint in explore, I thought it'd now be okay to use the Riding hall blueprint. So I went to check my inventory and use the Riding hall lvl1 blueprint as that was not in my library yet. But funnily enough I can't find it? It's not in my library either. Definitely didn't sell or destory it.

Perhaps swapping the same blueprint in explore made it disappear? owo;

Thanks for reporting!

There's really a bug with swapping the same recipe through Scriptorium. We returned you Blueprints: Ridinghall (lvl1) and removed the ability to swap the same recipes.

Sorry for the inconvenience.