Force crash on join game packet failure

src/main/java/me/cortex/voxy/client/mixin/minecraft/MixinClientCommonNetworkHandler.java

@@ -0,0 +1,24 @@
+package me.cortex.voxy.client.mixin.minecraft;
+
+import net.minecraft.client.network.ClientCommonNetworkHandler;
+import net.minecraft.network.packet.Packet;
+import net.minecraft.network.packet.s2c.play.GameJoinS2CPacket;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ClientCommonNetworkHandler.class)
+public class MixinClientCommonNetworkHandler {
+    @Inject(method = "onPacketException", at = @At("HEAD"), cancellable = true)
+    private void handleDisconnectAsCrash(Packet<?> packet, Exception exception, CallbackInfo ci) {
+        if (packet instanceof GameJoinS2CPacket) {
+            ci.cancel();
+            if (exception instanceof RuntimeException re) {
+                throw re;
+            } else {
+                throw new RuntimeException("Force crashing due to exception during on game join", exception);
+            }
+        }
+    }
+}

src/main/resources/client.voxy.mixins.json

@@ -8,6 +8,7 @@
     "minecraft.MixinDebugHud",
     "minecraft.MixinMinecraftClient",
     "minecraft.MixinWorldRenderer",
+    "minecraft.MixinClientCommonNetworkHandler",
     "sodium.MixinDefaultChunkRenderer",
     "sodium.MixinRenderSectionManager"
   ],