Index: src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java	(revision 3bf75f9c719825476df0f5c8979efcd01105f93e)
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java	(date 1609170790072)
@@ -1255,10 +1255,6 @@
     }
 
     public static void handleInventoryCloseEvent(EntityHuman human) {
-        // SPIGOT-5799 - no need to fire for when no inventory open
-        if (human.activeContainer == human.defaultContainer) {
-            return;
-        }
         InventoryCloseEvent event = new InventoryCloseEvent(human.activeContainer.getBukkitView());
         human.world.getServer().getPluginManager().callEvent(event);
         human.activeContainer.transferTo(human.defaultContainer, human.getBukkitEntity());