Core/Player: properly clear m_items array when unequipping items from the bag

- Also cleanup weapon damage ap mult when direct destroying a equipped weapon

src/server/game/Entities/Player/Player.cpp

@@ -12246,6 +12246,8 @@ void Player::RemoveItem(uint8 bag, uint8 slot, bool update)
                     }
                 }
             }
+            else
+                m_items[slot] = nullptr;
 
             SetGuidValue(PLAYER_FIELD_INV_SLOT_HEAD + (slot * 2), ObjectGuid::Empty);
 
@@ -12352,11 +12354,13 @@ void Player::DestroyItem(uint8 bag, uint8 slot, bool update)
             // equipment and equipped bags can have applied bonuses
             if (slot < INVENTORY_SLOT_BAG_END)
             {
-
                 // item set bonuses applied only at equip and removed at unequip, and still active for broken items
                 if (pProto->ItemSet)
                     RemoveItemsSetItem(this, pProto);
 
+                // clear m_items so weapons for example can be registered as unequipped
+                m_items[slot] = nullptr;
+
                 _ApplyItemMods(pItem, slot, false);
             }
 
@@ -12382,7 +12386,9 @@ void Player::DestroyItem(uint8 bag, uint8 slot, bool update)
                 SetVisibleItemSlot(slot, nullptr);
             }
 
-            m_items[slot] = nullptr;
+            // clear for rest of items (ie nonequippable)
+            if (slot >= INVENTORY_SLOT_BAG_END)
+                m_items[slot] = nullptr;
         }
         else if (Bag* pBag = GetBagByPos(bag))
             pBag->RemoveItem(slot, update);