No need to bring in Gson instance, when toString() does the same thing.

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -193,7 +193,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
         // legacy message and then inject the legacy text into a component... yuck!
         JsonObject object = new JsonObject();
         object.addProperty("text", ComponentSerializers.LEGACY.serialize(component));
-        json = VelocityServer.GSON.toJson(object);
+        json = object.toString();
       }
     } else {
       json = ComponentSerializers.JSON.serialize(component);