Not sure if this is a bug... I just started trying to locate things outside of the realm of what the help file says..
As time goes on, and if I get bored, I'll try to exploit the spell even more to try to locate things we're not supposed to.

The below results come from a c "elemental attunement" blood

You cast your arms wide, sending forth a searching sphere of
elemental magic.
A large thaumaturgic circle in A Heavily Warded Chamber

That circle (not from a PC conjurer) was flagged as the wrong material.

valguarnera@carrionfields.com