I just farmed 7 Remnants of Cruelty, merrily consuming them whenever I found one. Just to find out at the end that there's a cooldown on them and only the first one ever registered. But of course the others are gone from my inventory, too ...
Wait, I just realized the 3 Remnants of Deception all registered ... I got those on the first day and didn't even immediately consume them, but used all three of them directly after each other.
So ... they don't even work the same way? There's a cooldown on Remnants of Cruelty, but none on the Remnants of Deception?
I've had the same problem with the class script scraps - forgot to read one and consumed it next day after I got a second one. Triggered the cooldown, lost one of the scraps ...