Observed behaviour

i crafted the shield and tried using it against a zombie only to see that he can pass through it on both sides
I then tested with other mobs and same apply from my testing this happens both in singleplayer and multiplayer

Expected behaviour

For the Shield spell to stop entitys

Steps to reproduce

Cast Shield
lure something through it
observer them walking through it

Server Type

Dedicated Server

Crashlog

No response

Iron's Spells N Spellbooks version

1.21.1-3.10.1

Forge version

NeoForge 1.21.1 21.1.143

Other mods

3d-Skin-Layers [1.7.5]
AmbientSounds [6.1.7]
Amendments [1.21-1.2.24]
Another Furniture [4.0.0]
AppleSkin [3.0.5+mc1.21]
Aquaculture 2 [2.7.14]
Aquaculture Delight [1.1.0]
Architectury [13.0.8]
Athena [4.0.1]
AutoReconnect [1.0.4+1.21]
Autochef's Delight [2.0.2+neoforge]
Balkon's WeaponMod: Legacy [1.23.2]
Balm [21.0.38]
Barbeque's Delight [1.2.0+3]
Better Tridents [21.1.0]
BetterBrightnessSliderRespawn [1.0]
BetterF3 [11.0.3]
Biolith [3.0.1]
Bookshelf [21.1.53]
Brewin' And Chewin' [4.2.5]
Bridging Mod [2.6.2+1.21.1]
Butchercraft [2.6.3]
Camera Mod [1.21.1-1.0.19]
Carry On [2.2.2]
Chat Heads [0.13.13]
Chipped [4.0.2]
ChippedExpress [1.3.2]
Cloth Config v15 API [15.0.140]
Collective [8.1]
Controlling [19.0.5]
Cooking for Blockheads [21.1.12]
Corn Delight [1.1.4-1.21.1]
Corpse [1.21.1-1.1.5]
Corpse Curios Compatibility [2.2.2]
Crabber's Delight [1.1.7a]
CraterLib [2.1.4]
Create [6.0.4]
Create Encased [1.7.1-fix2]
Create Man of Many Planes [1.1]
Create: Copper and Zinc [1.6.0]
Create: Desires 2 Dreams [2.0.0]
Create: Dragons Plus [1.1.1]
Create: Enchantment Industry [2.0.0]
Create: Framed [1.6.3]
Create: Garnished [2.1.2]
Create: Pattern Schematics [2.0.6]
Create: Stones [2.0.0]
Create: Trading Floor [3.0.4]
Create: Vibrant Vaults [0.3.2]
Create: Winery [1.4.0]
CreativeCore [2.13.0]
Cubes Without Borders [3.0.0+mc1.21]
Cultural Delights [0.17.3]
Curios API [9.4.1+1.21.1]
Dis-Enchanting Table [4.0.2]
Display Delight [1.2.0]
Distant Horizons [2.3.2-b]
Double Doors [6.2]
Dynamic FPS [3.9.2]
EMI [1.1.21+1.21.1+neoforge]
EMI Enchanting [0.1.2+1.21+neoforge]
EMI Loot [0.7.5+1.21+neoforge]
EMI Ores [1.2+1.21.1+neoforge]
EMI Professions (EMIP) [1.0.3]
Egg Delight [1.2]
EnchantmentDescriptions [21.1.7]
Entity Model Features [2.4.1]
Entity Sound Features [0.4]
Entity Texture Features [6.2.9]
EntityCulling [1.7.4]
Euphoria Patcher [1.5.2-r5.4-neoforge]
Expanded Delight [0.1.3.1]
Extra Delight [2.4.2]
FTB Library [2101.1.12]
FTB Ultimine [2101.1.1]
FTB XMod Compat [21.1.3]
Farmer's Delight [1.2.7]
Ferrite Core [7.0.2]
FirstPerson [2.4.9]
Forgematica [0.2.3-mc1.21.1]
Forgified Fabric API [0.107.0+2.0.26+1.21.1]
FramedBlocks [10.3.1]
Fruits Delight [1.2.7]
Full Brightness Toggle [4.3]
Fusion [1.2.5]
Fzzy Config [0.6.8+1.21+neoforge]
GeckoLib 4 [4.7.5.1]
HT's TreeChop [0.19.3]
Handcrafted [4.0.3]
ImmediatelyFast [1.6.5+1.21.1]
Immersive Aircraft [1.2.2+1.21.1]
Iris [1.8.8+mc1.21.1]
Iron's Spells 'n Spellbooks [1.21.1-3.10.1]
Jade [15.10.0+neoforge]
Jade Addons [6.1.0+neoforge]
Just Enough Items [19.21.0.247]
Kotlin for Forge [uZAwdzAR]
KubeJS [2101.7.1-build.181]
Lithium [0.15.0+mc1.21.1]
Lootr [1.21-1.10.35.91]
M.R.U [1.0.16+1.21.1+neoforge]
MCPitanLib [3.2.1-1.21.1-neoforge]
MIMI Mod [1.21.1-4.1.3-neo]
MaFgLib [0.2.11-mc1.21.1]
Macaw's Bridges [3.0.0]
Macaw's Doors [1.1.2]
Macaw's Fences and Walls [1.2.0]
Macaw's Furniture [3.3.0]
Macaw's Lights and Lamps [1.1.1]
Macaw's Paintings [1.0.5]
Macaw's Paths and Pavings [1.1.0]
Macaw's Roofs [2.3.1]
Macaw's Trapdoors [1.1.4]
Macaw's Windows [2.3.2]
Man of Many Planes [0.2.1+1.21.1]
Minor Audio Inconvenience [0.2.4-neoforge]
Mixed Litter [0.0.2]
Mixin Trace Reforged [1.0.0]
Mob Lassos [21.1.0]
Mod Sound Volume Options [1.0.4-1.21]
MonoLib [2.0.0]
Moonlight Lib [1.21-2.18.5]
More Culling [1.0.6]
More Delight [25.01.13a-1.21-neoforge]
Mouse Tweaks [2.26.1]
Mysterious Mountain Lib [1.1.8-1.21.1]
Necronomicon [1.6.0]
Nemo's Inventory Sorting [1.21.1-1.8.1]
No Chat Reports [1.21.1-v2.9.1]
No Man's Land [1.1.2]
NotEnoughAnimations [1.9.3]
Open Parties PvP Support [1.0.0]
Open Parties and Claims [0.24.0]
Packet Fixer [2.1.0]
Pineapple Delight [1.0.4-1.21.1-neoforge]
Player Animator [2.0.1+1.21.1]
Plushie Mod [1.5.1]
Polymorph [1.0.8+1.21.1]
Polytone [1.21-3.3.4]
PrickleMC [21.1.6]
ProbeJS [7.5.1]
Puzzles Lib [21.1.33]
ReHooked [1.9.4-1.21.1]
Rechiseled [1.1.6+a]
Rechiseled: Chipped [1.2]
Reese's Sodium Options [1.8.3+mc1.21.4]
Resourceful Lib [3.0.12]
Rhino [2101.2.7-build.74]
Rustic Delight [1.4.1]
Screenshot Compression [1.1]
Searchables [1.0.2]
Simple RPC [4.0.1]
Simple Voice Chat [1.21.1-2.5.29]
Small Ships [2.0.0-b2.1]
Sodium [0.6.13+mc1.21.1]
Sodium Dynamic Lights [1.0.9]
Sodium Extra [0.6.0+mc1.21.1]
Sodium Options API [1.0.10]
Sodium Options Mod Compat [1.0.0]
Sodium Shadowy Path Blocks [4.0.0]
Sophisticated Backpacks [3.24.3]
Sophisticated Core [1.3.19]
Sound Physics Remastered [1.21.1-1.4.10]
Sounds [2.4.10+1.21.1+neoforge]
SoundsBeGone [1.3.5]
Storage Delight [25.03.09-1.21-neoforge]
SuperMartijn642's Config Library [1.1.8]
SuperMartijn642's Core Lib [1.1.18+a]
Supplementaries [1.21-3.1.3]
Supplementaries Squared [1.21-1.2.8]
The Broken Script [1.9.3+mc1.21.1-unofficial-alpha.10]
UI Lib [1.0-1.21.1]
Vegan Delight [1.4.2]
Visual Workbench [21.1.0]
Waystones [21.1.13]
Xaero's Minimap [25.2.0]
Xaero's World Map [1.39.4]
YUNG's API [1.21.1-NeoForge-5.1.4]
YetAnotherConfigLib [3.6.6+1.21.1-neoforge]
Zume [1.1.4]
create: things and misc [1.0.0]
oωo [0.12.15.1-beta.2+1.21]
spark [1.10.124]

Crashlog Check

• I understand if this is a crashbug and I did not attach a crashlog, this will not be handled

After testing on a fresh instance this seems to not happen
Might this be something that can be disabled in config files?
Weird.

That's because of Lithium [0.15.0+mc1.21.1]. For now, you can solve it by adding mixin.entity.collisions=false to Lithium config file.

duplicate of #820