applying altrisi's observations.

src/main/java/carpet/CarpetSettings.java

@@ -819,7 +819,7 @@ public class CarpetSettings
                     "'structureBlockOutlineDistance' may be required for",
                     "correct rendering of long structures."},
             options = {"48", "96", "192", "256"},
-            category = {CREATIVE, CLIENT},
+            category = CREATIVE,
             validate = StructureBlockLimitValidator.class,
             strict = false
     )

src/main/java/carpet/mixins/UpdateStructureBlockC2SPacketMixin.java

@@ -38,7 +38,7 @@ public class UpdateStructureBlockC2SPacketMixin {
     )
     private void structureBlockLimitsWrite(PacketByteBuf buf, CallbackInfo ci) {
         //client method, only applicable if with carpet is on the server, or running locally
-        if (CarpetSettings.structureBlockLimit >= 128 && (CarpetClient.isCarpet() || CarpetServer.minecraft_server != null))
+        if (CarpetSettings.structureBlockLimit >= 128)
         {
             buf.writeInt(this.offset.getX());
             buf.writeInt(this.offset.getY());