PaperMC/paper-server/nms-patches/net/minecraft/world/level/block/BlockDispenser.patch

--- a/net/minecraft/world/level/block/BlockDispenser.java
+++ b/net/minecraft/world/level/block/BlockDispenser.java
@@ -46,6 +46,7 @@
         object2objectopenhashmap.defaultReturnValue(new DispenseBehaviorItem());
     });
     private static final int TRIGGER_DURATION = 4;
+    public static boolean eventFired = false; // CraftBukkit
 
     public static void registerBehavior(IMaterial imaterial, IDispenseBehavior idispensebehavior) {
         BlockDispenser.DISPENSER_REGISTRY.put(imaterial.asItem(), idispensebehavior);
@@ -89,6 +90,7 @@
             IDispenseBehavior idispensebehavior = this.getDispenseMethod(itemstack);
 
             if (idispensebehavior != IDispenseBehavior.NOOP) {
+                eventFired = false; // CraftBukkit - reset event status
                 tileentitydispenser.setItem(i, idispensebehavior.dispense(sourceblock, itemstack));
             }