See CaffeineMC/sodium#1602, the crash report attached there and JellySquids comment. I can't really add anything else but I wanted to let you know of the issue.

Same issue! helpful thread, thanks! Will uninstall iceberg and legendary tooltips for now :P

Thanks for creating this, I've received a lot of reports about it recently. I've determined the cause of the crash and prepared a fix for it, however version 0.4.10 of Sodium will be coming out soon(ish?) which will break my fix. I am going to hold off on releasing an updated Iceberg build with a fix until Sodium releases version 0.4.10 because of this.
In the meantime, you can either downgrade Sodium to version 0.4.8 or disable 3D item previews in Legendary Tooltips if you want to continue using both mods.

Yes, this is the same issue.

IDK it's the same issue or not but here is the bug report
---- Minecraft Crash Report ----
// My bad.

Time: 2023-02-10 22:11:03
Description: Rendering item

java.lang.ClassCastException

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at com.anthonyhilyard.iceberg.renderer.CustomItemRenderer.renderDetailModelIntoGUI(CustomItemRenderer.java:620)
Mixins in Stacktrace: None found

-- Item being rendered --
Details:
Item Type: netherite_sword
Registry Name: minecraft:netherite_sword
Item Damage: 133
Item NBT: {Damage:133,Enchantments:[{id:"minecraft:sharpness",lvl:5s}],RepairCost:1,display:{Name:'{"text":"emerald sword"}'}}
Item Foil: true
Stacktrace:
at com.anthonyhilyard.iceberg.renderer.CustomItemRenderer.renderDetailModelIntoGUI(CustomItemRenderer.java:620)
at com.anthonyhilyard.legendarytooltips.tooltip.ItemModelComponent.method_32666(ItemModelComponent.java:95)
at net.minecraft.class_437.redirect$ehp000$drawPosAwareComponent(class_437.java:12258)
at net.minecraft.class_437.method_32633(class_437.java:283)
at net.minecraft.class_437.method_32634(class_437.java:193)
at net.minecraft.class_481.method_25409(class_481.java:779)
at net.minecraft.class_465.method_2380(class_465.java:188)
at net.minecraft.class_481.method_25394(class_481.java:745)
at net.minecraft.class_437.method_47413(class_437.java:113)
at net.minecraft.class_757.method_3192(class_757.java:929)
at net.minecraft.class_310.method_1523(class_310.java:1193)
at net.minecraft.class_310.method_1514(class_310.java:781)
at net.minecraft.client.main.Main.method_44604(Main.java:244)
at net.minecraft.client.main.Main.main(Main.java:51)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Mixins in Stacktrace: None found

-- Screen render details --
Details:
Screen name: net.minecraft.class_481
Mouse location: Scaled: (311, 191). Absolute: (2495.000000, 1528.000000)
Screen size: Scaled: (480, 270). Absolute: (3840, 2160). Scale factor of 8.000000

In the meantime, you can either downgrade Sodium to version 0.4.8 or disable 3D item previews in Legendary Tooltips if you want to continue using both mods.

how would one disable 3D item previews? i could just have missed it entirely, but i didn't see an option for it in the config.

In the meantime, you can either downgrade Sodium to version 0.4.8 or disable 3D item previews in Legendary Tooltips if you want to continue using both mods.

how would one disable 3D item previews? i could just have missed it entirely, but i didn't see an option for it in the config.

Set the render_item_model option to "NONE".

ahh, okay sorry. thank you!

Sorry for the delay everyone, this issue has been fixed in Iceberg version 1.1.5, which you can find here: https://www.curseforge.com/minecraft/mc-mods/iceberg-fabric/files/44654276