Fix handling of untracked entities

Some simple meta handlers do not go through entity rewriters, suddenly having to deal with invalid metadata because of plugins' bad concurrency handling
Closes #412

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java

@@ -52,7 +52,6 @@ public abstract class EntityRewriterBase<T extends BackwardsProtocol> extends En
     private final MetaType displayVisibilityMetaType;
     private final int displayNameIndex;
     private final int displayVisibilityIndex;
-    protected boolean allowNullEntityType;
 
     EntityRewriterBase(T protocol, MetaType displayNameMetaType, int displayNameIndex,
                        MetaType displayVisibilityMetaType, int displayVisibilityIndex) {
@@ -65,13 +64,9 @@ public abstract class EntityRewriterBase<T extends BackwardsProtocol> extends En
 
     @Override
     public void handleMetadata(int entityId, List<Metadata> metadataList, UserConnection connection) {
-        EntityType type = tracker(connection).entityType(entityId);
-        if (type == null && !allowNullEntityType) {
-            return;
-        }
-
         super.handleMetadata(entityId, metadataList, connection);
 
+        EntityType type = tracker(connection).entityType(entityId);
         if (type == null) {
             return; // Don't handle untracked entities - basically always the fault of a plugin sending virtual entities through concurrency-unsafe handling
         }

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_17_1to1_18/packets/EntityPackets1_18.java

@@ -38,7 +38,6 @@ public final class EntityPackets1_18 extends EntityRewriter<Protocol1_17_1To1_18
 
     public EntityPackets1_18(final Protocol1_17_1To1_18 protocol) {
         super(protocol);
-        allowNullEntityType = true;
     }
 
     @Override