Use more snapshot-less holders on Paper.

This is already past the debounce so in theory it's not getting hit *often*, but I guess if it's really slow it'll still show up.

Author: wizjany

worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java

@@ -1241,9 +1241,9 @@ private static <T extends Event & Cancellable> void handleInventoryHolderUse(T o
                     useBlockEvent.setAllowed(true);
                 }
                 Events.fireToCancel(originalEvent, useBlockEvent);
-            } else if (holder instanceof DoubleChest) {
-                InventoryHolder left = ((DoubleChest) holder).getLeftSide();
-                InventoryHolder right = ((DoubleChest) holder).getRightSide();
+            } else if (holder instanceof DoubleChest doubleChest) {
+                InventoryHolder left = PaperLib.isPaper() ? doubleChest.getLeftSide(false) : doubleChest.getLeftSide();
+                InventoryHolder right = PaperLib.isPaper() ? doubleChest.getRightSide(false) : doubleChest.getRightSide();
                 if (left instanceof Chest) {
                     Events.fireToCancel(originalEvent, new UseBlockEvent(originalEvent, cause, ((Chest) left).getBlock()));
                 }