1.21.9

src/main/java/com/kasetoatz/stasisrods/mixin/FishingRodItemMixin.java

@@ -3,7 +3,6 @@ package com.kasetoatz.stasisrods.mixin;
 import net.minecraft.block.BlockState;
 import net.minecraft.component.DataComponentTypes;
 import net.minecraft.component.type.NbtComponent;
-import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.attribute.EntityAttributes;
 import net.minecraft.entity.decoration.ArmorStandEntity;
 import net.minecraft.entity.player.PlayerEntity;
@@ -16,7 +15,6 @@ import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
 import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.hit.HitResult;
-import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
@@ -32,10 +30,14 @@ public class FishingRodItemMixin
     @Inject(method="use", at=@At("HEAD"), cancellable = true)
     public void use(World world, PlayerEntity user, Hand hand, CallbackInfoReturnable<ActionResult> cir)
     {
+        if (world.isClient())
+        {
+            return;
+        }
         ItemStack stack = user.getStackInHand(hand);
         if (tryDiscardPlaceholder(stack, world.getServer()))
         {
-            stack.damage(1, user, LivingEntity.getSlotForHand(hand));
+            stack.damage(1, user, hand.getEquipmentSlot());
             world.playSound(
                 null,
                 user.getX(),

src/main/resources/fabric.mod.json

@@ -7,7 +7,7 @@
   "authors": [],
   "contact": {},
   "license": "MIT",
-  "environment": "server",
+  "environment": "*",
   "mixins": [
     "stasisrods.mixins.json"
   ],