Post the error you are getting.
Or the exact item you are trying with.

 

@Wazupbutrcup cannot reproduce.
Works perfectly fine for me.
Testing on Healing Potions.

You're likely using the feature incorrectly, visit the wiki for more information.
Ensure it's actually toggled on, etc.

 

@Wazupbutrcup @314
Thanks for the added information.
I've reported this to the original developer, however if they are unable to fix it, we will have to wait for our developer to return from his medical leave to fork the project and work on it from our end.

 

I am unable to reproduce this issue with health potion, but I am having a similar problem with tools and fire resistance potions. When I have the same item in /if menu 2+ times, the filter stops working.
On a related note, though the iteminfo for tools with different durability is technically different, I would still expect one item filter to filter out the tool with any durability. It would be really annoying to have to add a filter of an item for every durability.

 

Thanks for the additional information.

 

@Wazupbutrcup @314 @cike25
We've added the following list to our setup.
This should fix issues with potions and tools.
Keep in mind however the major limitation here with potions is that it'll simply filter all of them or none of them, as opposed to specific potions.

Let us know if this fixes your issues, and please look over my list and let me know if I added something I shouldn't have or if I perhaps forgot to add something.

Code:

# Define what items should be filtered only by the material name.
# This ignores all the ItemMeta the item has (display name, lore, enchants, etc.)
#Tools
- WOODEN_AXE
- WOODEN_HOE
- WOODEN_SHOVEL
- WOODEN_PICKAXE
- STONE_AXE
- STONE_HOE
- STONE_SHOVEL
- STONE_PICKAXE
- IRON_AXE
- IRON_HOE
- IRON_SHOVEL
- IRON_PICKAXE
- GOLDEN_AXE
- GOLDEN_HOE
- GOLDEN_SHOVEL
- GOLDEN_PICKAXE
- DIAMOND_AXE
- DIAMOND_HOE
- DIAMOND_SHOVEL
- DIAMOND_PICKAXE
- NETHERITE_AXE
- NETHERITE_HOE
- NETHERITE_SHOVEL
- NETHERITE_PICKAXE
- BRUSH
- CARROT_ON_A_STICK
- FISHING_ROD
- FLINT_AND_STEEL
- SHEARS
- SHIELD
- WARPED_FUNGUS_ON_A_STICK
#Weapons
- BOW
- CROSSBOW
- TRIDENT
- WOODEN_SWORD
- STONE_SWORD
- IRON_SWORD
- GOLDEN_SWORD
- DIAMOND_SWORD
- NETHERITE_SWORD
#Armor
- LEATHER_HELMET
- LEATHER_CHESTPLATE
- LEATHER_LEGGINGS
- LEATHER_BOOTS
- CHAINMAIL_HELMET
- CHAINMAIL_CHESTPLATE
- CHAINMAIL_LEGGINGS
- CHAINMAIL_BOOTS
- IRON_HELMET
- IRON_CHESTPLATE
- IRON_LEGGINGS
- IRON_BOOTS
- GOLDEN_HELMET
- GOLDEN_CHESTPLATE
- GOLDEN_LEGGINGS
- GOLDEN_BOOTS
- DIAMOND_HELMET
- DIAMOND_CHESTPLATE
- DIAMOND_LEGGINGS
- DIAMOND_BOOTS
- NETHERITE_HELMET
- NETHERITE_CHESTPLATE
- NETHERITE_LEGGINGS
- NETHERITE_BOOTS
#Other
- ANVIL
- CARVED_PUMPKIN
- ELYTRA
- GOAT_HORN
- POTION
- RECOVERY_COMPASS
- SCULK_SENSOR
- SCULK_CATALYST
- TURTLE_HELMET

 

Code:

# Define what items should be filtered only by the material name.
# This ignores all the ItemMeta the item has (display name, lore, enchants, etc.)
#Tools
- WOODEN_AXE
- WOODEN_HOE
- WOODEN_SHOVEL
- WOODEN_PICKAXE
- STONE_AXE
- STONE_HOE
- STONE_SHOVEL
- STONE_PICKAXE
- IRON_AXE
- IRON_HOE
- IRON_SHOVEL
- IRON_PICKAXE
- GOLDEN_AXE
- GOLDEN_HOE
- GOLDEN_SHOVEL
- GOLDEN_PICKAXE
- DIAMOND_AXE
- DIAMOND_HOE
- DIAMOND_SHOVEL
- DIAMOND_PICKAXE
- NETHERITE_AXE
- NETHERITE_HOE
- NETHERITE_SHOVEL
- NETHERITE_PICKAXE
- BRUSH
- CARROT_ON_A_STICK
- FISHING_ROD
- FLINT_AND_STEEL
- SHEARS
- SHIELD
- WARPED_FUNGUS_ON_A_STICK
#Weapons
- BOW
- CROSSBOW
- TRIDENT
- WOODEN_SWORD
- STONE_SWORD
- IRON_SWORD
- GOLDEN_SWORD
- DIAMOND_SWORD
- NETHERITE_SWORD
#Armor
- LEATHER_HELMET
- LEATHER_CHESTPLATE
- LEATHER_LEGGINGS
- LEATHER_BOOTS
- CHAINMAIL_HELMET
- CHAINMAIL_CHESTPLATE
- CHAINMAIL_LEGGINGS
- CHAINMAIL_BOOTS
- IRON_HELMET
- IRON_CHESTPLATE
- IRON_LEGGINGS
- IRON_BOOTS
- GOLDEN_HELMET
- GOLDEN_CHESTPLATE
- GOLDEN_LEGGINGS
- GOLDEN_BOOTS
- DIAMOND_HELMET
- DIAMOND_CHESTPLATE
- DIAMOND_LEGGINGS
- DIAMOND_BOOTS
- NETHERITE_HELMET
- NETHERITE_CHESTPLATE
- NETHERITE_LEGGINGS
- NETHERITE_BOOTS
#Other
- ANVIL
- CARVED_PUMPKIN
- ELYTRA
- GOAT_HORN
- POTION
- LINGERING_POTION
- SPLASH_POTION
- RECOVERY_COMPASS
- SCULK_SENSOR
- SCULK_CATALYST
- TURTLE_HELMET

I've added LINGERING_POTION & SPLASH_POTION to the above list which was likely your issue.
If you continue to have problems, in the future please use /itemdb on the item, and let me know the exact item name, so we can add it to the list.