Handle invalid uuid int array

Closes #2475

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/BukkitViaInjector.java

@@ -199,7 +199,7 @@ public class BukkitViaInjector implements ViaInjector {
     @Override
     public int getServerProtocolVersion() throws Exception {
         if (PaperViaInjector.PAPER_PROTOCOL_METHOD) {
-            // *Trust me, it's safe*
+            //noinspection deprecation
             return Bukkit.getUnsafe().getProtocolVersion();
         }
 

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/packets/InventoryPackets.java

@@ -209,7 +209,7 @@ public class InventoryPackets {
             rewriteAttributeName(attribute, "AttributeName", true);
             rewriteAttributeName(attribute, "Name", true);
             IntArrayTag uuidTag = attribute.get("UUID");
-            if (uuidTag != null) {
+            if (uuidTag != null && uuidTag.getValue().length == 4) {
                 UUID uuid = UUIDIntArrayType.uuidFromIntArray(uuidTag.getValue());
                 attribute.put("UUIDLeast", new LongTag(uuid.getLeastSignificantBits()));
                 attribute.put("UUIDMost", new LongTag(uuid.getMostSignificantBits()));