A little more documentation.

api/src/main/java/com/velocitypowered/api/util/LegacyChatColorUtils.java

@@ -8,11 +8,15 @@ import java.util.regex.Pattern;
  * LegacyChatColorUtils contains utilities for handling legacy Minecraft color codes. Generally, you should prefer
  * JSON-based components, but for convenience Velocity provides a limited set of tools to handle Minecraft color codes.
  */
-public enum LegacyChatColorUtils {
-    ;
+public class LegacyChatColorUtils {
+    private LegacyChatColorUtils() {
+        throw new AssertionError();
+    }
 
+    /**
+     * Represents the legacy Minecraft format character, the section symbol.
+     */
     public static final char FORMAT_CHAR = '\u00a7';
-    private static final Pattern CHAT_COLOR_MATCHER = Pattern.compile("(?i)" + Character.toString(FORMAT_CHAR) + "[0-9A-FL-OR]");
 
     /**
      * Translates a string with Minecraft color codes prefixed with a different character than the section symbol into
@@ -44,6 +48,11 @@ public enum LegacyChatColorUtils {
         return new String(textChars);
     }
 
+    /**
+     * A regex that matches all Minecraft color codes and removes them.
+     */
+    private static final Pattern CHAT_COLOR_MATCHER = Pattern.compile("(?i)" + Character.toString(FORMAT_CHAR) + "[0-9A-FL-OR]");
+
     /**
      * Removes all Minecraft color codes from the string.
      * @param text the text to remove color codes from

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

@@ -134,11 +134,17 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
             idRemapper = EntityIdRemapper.getMapper(joinGame.getEntityId(), player.getConnection().getProtocolVersion());
         } else {
             // In order to handle switching to another server we will need send three packets:
+            //
             // - The join game packet from the backend server
             // - A respawn packet with a different dimension
             // - Another respawn with the correct dimension
+            //
             // We can't simply ignore the packet with the different dimension. If you try to be smart about it it doesn't
             // work.
+            //
+            // Most notably, by having the client accept the join game packet, we can work around the need to perform
+            // entity ID rewrites, eliminating potential issues from rewriting packets and improving compatibility with
+            // mods.
             idRemapper.setServerEntityId(joinGame.getEntityId());
             player.getConnection().delayedWrite(joinGame);
             int tempDim = joinGame.getDimension() == 0 ? -1 : 0;