Enchanted books above the newAnvilLevelLimit value cannot be applied and will be reverted to whatever it is set to.

What is the modlist? also what did the sword have at the start?

The issue is an extension of the same vanilla mechanic: for example, trying to apply thorns 5 to a chestplate via an anvil will revert it to thorns 3. Before I knew this I tried removing all enchantment-related mods.

The diamond sword is unenchanted.
Here's the modlist taken from logs because I'm lazy:

• allarrowsinfinityfix 1.0.0
• amplified_nether 1.0.1
• antighost 1.18-fabric0.43.1-1.1.4
• anvilrestoration-fabric 1.1
• appleskin mc1.18-2.2.0
• architectury 3.4.9
• axolotlitemfix 1.1.3
• balm-fabric 2.4.1+0
• bcc fabric-1.0.4
• bclib 1.2.5
• bedspreads 1.5.0-1.18
• betterend 1.0.1
• betterf3 1.2.2
• betterfpsdist 1.18-1.5
• betterimpaling 2.0.4
• betterleads 1.0.1+1.18.1
• bettersafebed 1.18-fabric-a
• betterspawnercontrol-fabric 1.5
• betterthirdperson 1.6.0
• bettertridentreturn 1.18.1-1.0.2
• blockus 2.3.4+1.18.1
• bottledair-fabric 1.0
• bowinfinityfix rv11
• brb 1.5.6
• cardinal-components-base 4.0.1 via polymorph
• cardinal-components-block 4.0.1 via polymorph
• cardinal-components-entity 4.0.1 via polymorph
• cardinal-components-item 4.0.1 via polymorph
• cavetweaks 1.0
• cherishedworlds 2.0.1-1.18
• chisel 1.4.4
• chiselsandbits 1.2.77
• chunky 1.2.164
• cloth-basic-math 0.6.0 via cloth-config
• cloth-config 6.1.48
• collective-fabric 3.14
• com_moandjiezana_toml_toml4j 0.7.2 via dynamicfps
• comforts 1.0.0-1.18
• conduitspreventdrowned-fabric 1.5
• continuity 1.0.3+1.18
• controlling 9.0.11
• crowdin-translate 1.4+1.18 via antighost
• customizableelytra 1.5.3-1.18
• customstars 0.7+1.18
• cyclepaintings-fabric 2.1
• decorative_blocks 2.0.4
• decorative_winter 2.0.1
• dismountentity-fabric 1.5
• doubledoors-fabric 3.1
• dynamicfps 2.1.0
• enchdesc 9.0.11
• expanded_armor_enchanting 1.0.2
• expanded_axe_enchanting 1.0.3
• expanded_trident_enchanting 1.0.3
• experiencebugfix 18
• extendedbonemeal-fabric 1.4
• fabric 0.46.1+1.18
• fabric-api-base 0.4.1+b4f4f6cd65 via fabric
• fabric-api-lookup-api-v1 1.5.0+17be577f65 via fabric
• fabric-biome-api-v1 6.0.1+ded849a965 via fabric
• fabric-blockrenderlayer-v1 1.1.9+3ac43d9565 via fabric
• fabric-command-api-v1 1.1.6+3ac43d9565 via fabric
• fabric-commands-v0 0.2.5+b4f4f6cd65 via fabric
• fabric-containers-v0 0.1.18+d154e2c665 via fabric
• fabric-content-registries-v0 0.4.5+6f53a73d65 via fabric
• fabric-crash-report-info-v1 0.1.8+3ac43d9565 via fabric
• fabric-dimensions-v1 2.1.9+a1d9bbf565 via fabric
• fabric-entity-events-v1 1.4.5+6b21378a65 via fabric
• fabric-events-interaction-v0 0.4.16+bfa23f1765 via fabric
• fabric-events-lifecycle-v0 0.2.6+b4f4f6cd65 via fabric
• fabric-game-rule-api-v1 1.0.10+3ac43d9565 via fabric
• fabric-item-api-v1 1.3.0+691a79b565 via fabric
• fabric-item-groups-v0 0.3.3+3ac43d9565 via fabric
• fabric-key-binding-api-v1 1.0.8+c8aba2f365 via fabric
• fabric-keybindings-v0 0.2.6+b4f4f6cd65 via fabric
• fabric-language-kotlin 1.7.1+kotlin.1.6.10
• fabric-lifecycle-events-v1 1.4.10+c15ca33565 via fabric
• fabric-loot-tables-v1 1.0.8+3ac43d9565 via fabric
• fabric-mining-level-api-v1 1.0.3+3ac43d9565 via fabric
• fabric-mining-levels-v0 0.1.8+b4f4f6cd65 via fabric
• fabric-models-v0 0.3.3+3ac43d9565 via fabric
• fabric-networking-api-v1 1.0.18+3ac43d9565 via fabric
• fabric-networking-v0 0.3.5+b4f4f6cd65 via fabric
• fabric-object-builder-api-v1 1.11.1+3b82842e65 via fabric
• fabric-object-builders-v0 0.7.9+3ac43d9565 via fabric
• fabric-particles-v1 0.2.9+526dc1ac65 via fabric
• fabric-registry-sync-v0 0.9.0+befed49e65 via fabric
• fabric-renderer-api-v1 0.4.10+b0b66fc365 via fabric
• fabric-renderer-indigo 0.4.13+b0b66fc365 via fabric
• fabric-renderer-registries-v1 3.2.7+b4f4f6cd65 via fabric
• fabric-rendering-data-attachment-v1 0.3.4+7242e9d765 via fabric
• fabric-rendering-fluids-v1 0.1.18+3ac43d9565 via fabric
• fabric-rendering-v0 1.1.9+b4f4f6cd65 via fabric
• fabric-rendering-v1 1.10.3+6b21378a65 via fabric
• fabric-resource-conditions-api-v1 1.0.1+13eda06565 via fabric
• fabric-resource-loader-v0 0.4.11+3ac43d9514 via betterf3
• fabric-screen-api-v1 1.0.7+3ac43d9565 via fabric
• fabric-screen-handler-api-v1 1.1.11+3ac43d9565 via fabric
• fabric-structure-api-v1 2.1.0+0a73a6c265 via fabric
• fabric-tag-extensions-v0 1.2.5+3ac43d9565 via fabric
• fabric-textures-v0 1.0.9+3ac43d9565 via fabric
• fabric-tool-attribute-api-v1 1.3.5+fb3b57b465 via fabric
• fabric-transfer-api-v1 1.5.6+b4f4f6cd65 via fabric
• fabricloader 0.12.12
• fastbench 1.18.1-3
• fastfurnace 1.18-4
• fastopenlinksandfolders 1.0.1
• feature_nbt_deadlock_be_gone 1.0.1+1.18.1
• ferritecore 4.0.0
• fiber 0.23.0-2 via collective-fabric
• fixedanvilrepaircost-fabric 1.6
• flytre-lib-base 1.3.0 via flytre_lib
• flytre-lib-compat 1.0.0 via flytre_lib
• flytre-lib-config 1.1.0 via flytre_lib
• flytre-lib-event 1.0.1 via flytre_lib
• flytre-lib-gui 1.0.0 via flytre_lib
• flytre-lib-storage 2.3.2 via flytre_lib
• flytre_lib 1.4.4
• forgottenrecipes 1.18.1-1.0.0
• fpsreducer 1.25-mc1.18
• ftblibrary 1801.3.5-build.109
• glassential 1.3.0
• glowingbanners 1.1.0
• grass_pass 1.1.0
• imm_ptl_core 1.2.3 via immersive_portals
• immersive_portals 1.2.3
• indium 1.0.2-alpha2+mc1.18.1
• inventorytotem-fabric 1.5
• iris 1.2.0-pre
• itemmodelfix 1.0.3+1.18
• java 17
• kleeslabs 11.0.0
• lambdynlights 2.1.0+1.17
• lazy-language-loader 0.2.6
• lazydfu 0.1.2
• libcd 3.0.3+1.16.3 via blockus
• lightoverlay 6.0.4
• lithium 0.7.7
• lootcrates 2.7.0-1.18.1
• lumiwool 1.2.2
• mavm 1.0.7a
• minecraft 1.18.1
• modmenu 3.0.1
• morebannerfeatures 1.1.3
• mousetweaks 2.22
• naturescompass 1.18.1-2.0.2-fabric
• netherportalfix 9.0.0
• no_null_processors 2.0.1+1.18.1
• noenchantcap 1.18.1-fabric-2.1.1
• nullscape 1.1
• omega-config 1.0.8 via repurposed_structures
• onsoulfire 1.18-1
• org_anarres_jcpp 1.4.14 via iris
• org_aperlambda_lambdajcommon 1.8.1 via spruceui
• org_jetbrains_kotlin_kotlin-reflect 1.6.10 via fabric-language-kotlin
• org_jetbrains_kotlin_kotlin-stdlib 1.6.10 via fabric-language-kotlin
• org_jetbrains_kotlin_kotlin-stdlib-jdk7 1.6.10 via fabric-language-kotlin
• org_jetbrains_kotlin_kotlin-stdlib-jdk8 1.6.10 via fabric-language-kotlin
• org_jetbrains_kotlinx_kotlinx-coroutines-core-jvm 1.5.2 via fabric-language-kotlin
• org_jetbrains_kotlinx_kotlinx-coroutines-jdk8 1.5.2 via fabric-language-kotlin
• org_jetbrains_kotlinx_kotlinx-serialization-cbor-jvm 1.3.1 via fabric-language-kotlin
• org_jetbrains_kotlinx_kotlinx-serialization-core-jvm 1.3.1 via fabric-language-kotlin
• org_jetbrains_kotlinx_kotlinx-serialization-json-jvm 1.3.1 via fabric-language-kotlin
• org_joml_joml 1.10.2 via sodium
• org_slf4j_slf4j-api 1.7.12 via iris
• oro_config 2.1.0 via cavetweaks
• patchouli 1.18.1-64-FABRIC
• polymorph 0.0.19-1.18.1
• pride 1.1.0+1.17 via lambdynlights
• q_misc_util 1.2.3 via immersive_portals
• reinfbarrel 1.0.6+1.18
• reinfchest 1.0.6+1.18
• reinfcore 1.1.3+1.18 via reinfbarrel
• reinfshulker 1.1.8+1.18
• repurposed_structures 3.3.3+1.18.1
• rib 1.1.0-1.18.1
• roughlyenoughitems 7.1.390
• scaffoldingdropsnearby-fabric 1.5
• seedfix 1.0.0 via amplified_nether
• shroomlight_slab 1
• skinlayers 1.3.1
• sodium 0.4.0-alpha6+build.14
• someforgepatchesported 1.0.2
• spruceui 3.3.0+1.17 via betterleads
• starlight 1.0.0+fabric.d0a3220
• surfacemushrooms-fabric 1.2
• terraform-wood-api-v1 2.0.2 via blockus
• terralith 2.0.12
• tooltipfix 1.0.4-1.18
• veinmining 0.0.11-1.18
• wooltweaks-fabric 1.4
• worldedit 7.2.8+6008-1246d61
• xaerominimap 22.1.0
• xaeroworldmap 1.20.0

Not sure if present on the rewrite, closing for now.