So I got a drop of an item, and I wanted to see which rule it came under as I didn't think it was worth showing. It was unidentified originally and when copied into Filterblade(Alt + Ctrl + C) it showed that this item wouldn't be shown. I dropped it again to check, reloaded. No luck. It still shows while identified. Here is the item while identified.
Ny filterblade name is "N0__Brain" and the filter in question is Super Harsh. Thought I'd share in case it's a real bug.
Item Class: Body Armours
Rarity: Rare
Dusk Shell
Necrotic Armour
Evasion Rating: 733
Energy Shield: 147
Requirements:
Level: 84
Dex: 173 (unmet)
Int: 173
Sockets: G-G-B
Item Level: 86
{ Prefix Modifier "Spiny" (Tier: 3) — Damage, Physical }
Reflects 6(5-10) Physical Damage to Melee Attackers
{ Prefix Modifier "Chalybeous" (Tier: 4) — Mana }
+59(55-59) to maximum Mana
{ Prefix Modifier "Prime" (Tier: 1) — Life }
+185(175-189) to maximum Life
{ Suffix Modifier "of Snuffing" (Tier: 4) }
+12(11-13)% chance to Suppress Spell Damage
(50% of Damage from Suppressed Hits and Ailments they inflict is prevented)
{ Suffix Modifier "of the Maelstrom" (Tier: 3) — Elemental, Lightning, Resistance }
+39(36-41)% to Lightning Resistance
{ Suffix Modifier "of the Hydra" (Tier: 7) — Life }
Regenerate 30.2(24.1-32) Life per second