diff --git a/src/main/java/mendedminecarts/RailPlacementHelper.java b/src/main/java/mendedminecarts/RailPlacementHelper.java
new file mode 100644
index 0000000..7000ab5
--- /dev/null
+++ b/src/main/java/mendedminecarts/RailPlacementHelper.java
@@ -0,0 +1,8 @@
+package mendedminecarts;
+
+import net.minecraft.util.math.BlockPos;
+
+public class RailPlacementHelper {
+    public static final ThreadLocal<BlockPos> NO_CONNECT_POS = new ThreadLocal<>();
+
+}
diff --git a/src/main/java/mendedminecarts/mixin/placement/AbstractRailBlockMixin.java b/src/main/java/mendedminecarts/mixin/placement/AbstractRailBlockMixin.java
index 2990872..eaa7c24 100644
--- a/src/main/java/mendedminecarts/mixin/placement/AbstractRailBlockMixin.java
+++ b/src/main/java/mendedminecarts/mixin/placement/AbstractRailBlockMixin.java
@@ -19,11 +19,13 @@
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
+import static mendedminecarts.RailPlacementHelper.NO_CONNECT_POS;
+
 @Mixin(AbstractRailBlock.class)
 public abstract class AbstractRailBlockMixin extends Block implements Waterloggable {
-
     @Shadow @Final public static BooleanProperty WATERLOGGED;
 
     @Shadow @Final private boolean forbidCurves;
@@ -55,6 +57,8 @@ private void getSmartPlacementState(ItemPlacementContext ctx, CallbackInfoReturn
             boolean shouldCurve = (clickSide == Direction.UP || clickSide == Direction.DOWN);
 
             boolean isEastWest = railDirection == Direction.EAST || railDirection == Direction.WEST;
+
+            boolean modified = false;
             RailShape railShape = isEastWest ? RailShape.EAST_WEST : RailShape.NORTH_SOUTH;
             if (shouldAscend) {
                 if (railDirection == Direction.DOWN || railDirection == Direction.UP) {
@@ -75,6 +79,7 @@ private void getSmartPlacementState(ItemPlacementContext ctx, CallbackInfoReturn
                     }
                     if (railShape1 != null && !shouldDropRail(blockPos, ctx.getWorld(), railShape1)) {
                         railShape = railShape1;
+                        modified = true;
                     }
                 }
             } else if (shouldCurve && !this.forbidCurves) {
@@ -85,16 +90,37 @@ private void getSmartPlacementState(ItemPlacementContext ctx, CallbackInfoReturn
                 //SOUTH AND EAST are positive. SOUTH is Z axis, EAST is X
                 if (positiveX && positiveZ) {
                     railShape = RailShape.SOUTH_EAST;
+                    modified = true;
                 } else if (positiveX && negativeZ) {
                     railShape = RailShape.NORTH_EAST;
+                    modified = true;
                 } else if (negativeX && positiveZ) {
                     railShape = RailShape.SOUTH_WEST;
+                    modified = true;
                 } else if (negativeX && negativeZ) {
                     railShape = RailShape.NORTH_WEST;
+                    modified = true;
                 }
             }
-            retBlockState = retBlockState.with(this.getShapeProperty(), railShape);
-            cir.setReturnValue(retBlockState);
+            if (modified) {
+                retBlockState = retBlockState.with(this.getShapeProperty(), railShape);
+                cir.setReturnValue(retBlockState);
+            }
+            NO_CONNECT_POS.set(blockPos);
+        }
+    }
+
+    @Inject(
+            method = "onBlockAdded", at = @At("HEAD"), cancellable = true
+    )
+    private void cancelUpdates(BlockState state, World world, BlockPos pos, BlockState oldState, boolean notify, CallbackInfo ci) {
+        BlockPos noUpdatePos = NO_CONNECT_POS.get();
+        if (pos.equals(noUpdatePos)) {
+            ci.cancel();
+        }
+
+        if (noUpdatePos != null) {
+            NO_CONNECT_POS.set(null);
         }
     }
 }
diff --git a/src/main/java/mendedminecarts/mixin/placement/DetectorRailBlockMixin.java b/src/main/java/mendedminecarts/mixin/placement/DetectorRailBlockMixin.java
new file mode 100644
index 0000000..fd67da0
--- /dev/null
+++ b/src/main/java/mendedminecarts/mixin/placement/DetectorRailBlockMixin.java
@@ -0,0 +1,34 @@
+package mendedminecarts.mixin.placement;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.block.DetectorRailBlock;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import static mendedminecarts.RailPlacementHelper.NO_CONNECT_POS;
+
+@Mixin(DetectorRailBlock.class)
+public abstract class DetectorRailBlockMixin {
+
+    @Shadow protected abstract void updatePoweredStatus(World world, BlockPos pos, BlockState state);
+
+    @Inject(
+            method = "onBlockAdded", at = @At("HEAD"), cancellable = true
+    )
+    private void cancelUpdates(BlockState state, World world, BlockPos pos, BlockState oldState, boolean notify, CallbackInfo ci) {
+        BlockPos noUpdatePos = NO_CONNECT_POS.get();
+        if (pos.equals(noUpdatePos)) {
+            ci.cancel();
+            this.updatePoweredStatus(world, pos, state);
+        }
+
+        if (noUpdatePos != null) {
+            NO_CONNECT_POS.set(null);
+        }
+    }
+}
diff --git a/src/main/resources/mendedminecarts.mixins.json b/src/main/resources/mendedminecarts.mixins.json
index 9522edf..b50a74d 100644
--- a/src/main/resources/mendedminecarts.mixins.json
+++ b/src/main/resources/mendedminecarts.mixins.json
@@ -21,6 +21,7 @@
     "TntMinecartEntityMixin",
     "boat.BoatEntityMixin",
     "placement.AbstractRailBlockMixin",
+    "placement.DetectorRailBlockMixin",
     "settings.ClientPlayNetworkHandlerMixin",
     "settings.PlayerManagerMixin"
   ],