Things

bukkit/src/main/java/com/viaversion/viabackwards/BukkitPlugin.java

@@ -32,7 +32,7 @@ import org.bukkit.plugin.java.JavaPlugin;
 public class BukkitPlugin extends JavaPlugin implements ViaBackwardsPlatform {
 
     public BukkitPlugin() {
-        // MappingDataLoader caching is enabled in ViaVersion on versions that construct the plugin on load
+        // This is the only place we can enable this before ViaVersion is loaded and registers protocols
         MappingDataLoader.enableMappingsCache();
     }
 

common/src/main/java/com/viaversion/viabackwards/ViaBackwards.java

@@ -22,7 +22,7 @@ import com.google.common.base.Preconditions;
 import com.viaversion.viabackwards.api.ViaBackwardsConfig;
 import com.viaversion.viabackwards.api.ViaBackwardsPlatform;
 
-public class ViaBackwards {
+public final class ViaBackwards {
 
     private static ViaBackwardsPlatform platform;
     private static ViaBackwardsConfig config;

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java

@@ -82,6 +82,7 @@ public interface ViaBackwardsPlatform {
         getLogger().info("Loading translations...");
         TranslatableRewriter.loadTranslatables();
 
+        getLogger().info("Registering protocols...");
         final ProtocolManager protocolManager = Via.getManager().getProtocolManager();
         protocolManager.registerProtocol(new Protocol1_9_4To1_10(), ProtocolVersion.v1_9_3, ProtocolVersion.v1_10);
 

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

@@ -29,11 +29,12 @@ import com.viaversion.viaversion.libs.gson.JsonObject;
 import com.viaversion.viaversion.rewriter.ComponentRewriter;
 import java.util.HashMap;
 import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class TranslatableRewriter<C extends ClientboundPacketType> extends ComponentRewriter<C> {
 
     private static final Map<String, Map<String, String>> TRANSLATABLES = new HashMap<>();
-    protected final Map<String, String> newTranslatables;
+    private final Map<String, String> newTranslatables;
 
     public static void loadTranslatables() {
         JsonObject jsonObject = VBMappingDataLoader.loadFromDataDir("translation-mappings.json");
@@ -111,9 +112,13 @@ public class TranslatableRewriter<C extends ClientboundPacketType> extends Compo
 
     @Override
     protected void handleTranslate(JsonObject root, String translate) {
-        String newTranslate = newTranslatables.get(translate);
+        String newTranslate = mappedTranslationKey(translate);
         if (newTranslate != null) {
             root.addProperty("translate", newTranslate);
         }
     }
+
+    public @Nullable String mappedTranslationKey(final String translationKey) {
+        return newTranslatables.get(translationKey);
+    }
 }

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/Protocol1_12_2To1_13.java

@@ -64,7 +64,7 @@ public class Protocol1_12_2To1_13 extends BackwardsProtocol<ClientboundPackets1_
         TranslatableRewriter<ClientboundPackets1_13> translatableRewriter = new TranslatableRewriter<ClientboundPackets1_13>(this) {
             @Override
             protected void handleTranslate(JsonObject root, String translate) {
-                String newTranslate = newTranslatables.get(translate);
+                String newTranslate = mappedTranslationKey(translate);
                 if (newTranslate != null || (newTranslate = getMappingData().getTranslateMappings().get(translate)) != null) {
                     root.addProperty("translate", newTranslate);
                 }

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_3to1_19_4/packets/EntityPackets1_19_4.java

@@ -130,6 +130,11 @@ public final class EntityPackets1_19_4 extends EntityRewriter<ClientboundPackets
         });
         registerMetaTypeHandler(Types1_19_3.META_TYPES.itemType, Types1_19_3.META_TYPES.blockStateType, Types1_19_3.META_TYPES.particleType, Types1_19_3.META_TYPES.optionalComponentType);
 
+        filter().filterFamily(Entity1_19_4Types.MINECART_ABSTRACT).index(11).handler((event, meta) -> {
+            final int blockState = meta.value();
+            meta.setValue(protocol.getMappingData().getNewBlockStateId(blockState));
+        });
+
         filter().type(Entity1_19_4Types.TEXT_DISPLAY).index(22).handler(((event, meta) -> {
             // Send as custom display name
             event.setIndex(2);