reverting that merge of mixins since it will cause havoc on the future version branches

src/main/java/carpet/mixins/StructureBlockBlockEntity_limitsMixin.java

@@ -0,0 +1,53 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.minecraft.block.Block;
+import net.minecraft.block.entity.StructureBlockBlockEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Constant;
+import org.spongepowered.asm.mixin.injection.ModifyArg;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
+
+@Mixin(StructureBlockBlockEntity.class)
+public abstract class StructureBlockBlockEntity_limitsMixin
+{
+    @ModifyConstant(
+            method = "fromTag",
+            constant = @Constant(intValue = 48)
+    )
+    private int positiveLimit(int original) {
+        return CarpetSettings.structureBlockLimit;
+    }
+
+    @ModifyConstant(
+            method = "fromTag",
+            constant = @Constant(intValue = -48)
+    )
+    private int negativeLimit(int original) {
+        return -CarpetSettings.structureBlockLimit;
+    }
+
+    @ModifyArg(
+            method = "saveStructure(Z)Z",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lnet/minecraft/structure/Structure;saveFromWorld(Lnet/minecraft/world/World;Lnet/minecraft/util/math/BlockPos;Lnet/minecraft/util/math/BlockPos;ZLnet/minecraft/block/Block;)V"
+            ),
+            index = 4
+    )
+    private Block ignoredBlock(Block original) {
+        return CarpetSettings.structureBlockIgnoredBlock;
+    }
+
+    @Environment(EnvType.CLIENT)
+    @ModifyConstant(
+            method = "getSquaredRenderDistance",
+            constant = @Constant(doubleValue = 96d)
+    )
+    private double outlineRenderDistanceLimit(double original) {
+        return CarpetSettings.structureBlockOutlineDistance;
+    }
+}