PaperMC/paper-server/nms-patches/net/minecraft/world/item/ItemArmorStand.patch

--- a/net/minecraft/world/item/ItemArmorStand.java
+++ b/net/minecraft/world/item/ItemArmorStand.java
@@ -53,6 +53,11 @@
                     float f = (float) MathHelper.floor((MathHelper.wrapDegrees(itemactioncontext.getRotation() - 180.0F) + 22.5F) / 45.0F) * 45.0F;
 
                     entityarmorstand.moveTo(entityarmorstand.getX(), entityarmorstand.getY(), entityarmorstand.getZ(), f, 0.0F);
+                    // CraftBukkit start
+                    if (org.bukkit.craftbukkit.event.CraftEventFactory.callEntityPlaceEvent(itemactioncontext, entityarmorstand).isCancelled()) {
+                        return EnumInteractionResult.FAIL;
+                    }
+                    // CraftBukkit end
                     worldserver.addFreshEntityWithPassengers(entityarmorstand);
                     world.playSound((EntityHuman) null, entityarmorstand.getX(), entityarmorstand.getY(), entityarmorstand.getZ(), SoundEffects.ARMOR_STAND_PLACE, SoundCategory.BLOCKS, 0.75F, 0.8F);
                     entityarmorstand.gameEvent(GameEvent.ENTITY_PLACE, itemactioncontext.getPlayer());