Fix deployers not calling BlockItem#onUse

src/main/java/com/simibubi/create/content/kinetics/deployer/DeployerHandler.java

@@ -300,7 +300,7 @@ public class DeployerHandler {
 			return;
 		if (useItem == DENY)
 			return;
-		if (item instanceof BlockItem && !(item instanceof CartAssemblerBlockItem)
+		if (item instanceof CartAssemblerBlockItem
 			&& !clickedState.canBeReplaced(new BlockPlaceContext(itemusecontext)))
 			return;
 

src/main/java/com/simibubi/create/foundation/mixin/BlockItemMixin.java

@@ -0,0 +1,27 @@
+package com.simibubi.create.foundation.mixin;
+
+import com.simibubi.create.content.kinetics.deployer.DeployerFakePlayer;
+
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.item.BlockItem;
+
+import net.minecraft.world.item.context.BlockPlaceContext;
+
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.state.BlockState;
+
+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.CallbackInfoReturnable;
+
+@Mixin(BlockItem.class)
+public class BlockItemMixin {
+	@Inject(method = "place", at = @At("HEAD"), cancellable = true)
+	private void create$fixDeployerPlacement(BlockPlaceContext pContext, CallbackInfoReturnable<InteractionResult> cir) {
+		BlockState state = pContext.getLevel().getBlockState(((UseOnContextAccessor) pContext).create$getHitResult().getBlockPos());
+		if (state != Blocks.AIR.defaultBlockState() && pContext.getPlayer() instanceof DeployerFakePlayer) {
+			cir.setReturnValue(InteractionResult.PASS);
+		}
+	}
+}

src/main/java/com/simibubi/create/foundation/mixin/UseOnContextAccessor.java

@@ -0,0 +1,14 @@
+package com.simibubi.create.foundation.mixin;
+
+import net.minecraft.world.item.context.UseOnContext;
+
+import net.minecraft.world.phys.BlockHitResult;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+@Mixin(UseOnContext.class)
+public interface UseOnContextAccessor {
+	@Invoker("getHitResult")
+	BlockHitResult create$getHitResult();
+}

src/main/resources/create.mixins.json

@@ -6,6 +6,7 @@
   "compatibilityLevel": "JAVA_17",
   "refmap": "create.refmap.json",
   "mixins": [
+    "BlockItemMixin",
     "ClientboundMapItemDataPacketMixin",
     "ContraptionDriverInteractMixin",
     "CustomItemUseEffectsMixin",
@@ -15,6 +16,7 @@
     "MainMixin",
     "MapItemSavedDataMixin",
     "TestCommandMixin",
+    "UseOnContextAccessor",
     "WaterWheelFluidSpreadMixin",
     "accessor.AbstractProjectileDispenseBehaviorAccessor",
     "accessor.DispenserBlockAccessor",