Paper/nms-patches/PacketPlayOutLogin.patch

--- a/net/minecraft/server/PacketPlayOutLogin.java
+++ b/net/minecraft/server/PacketPlayOutLogin.java
@@ -54,7 +54,13 @@
         }
 
         packetdataserializer.writeByte(i);
-        packetdataserializer.writeInt(this.d);
+        // CraftBukkit start
+        if (packetdataserializer.version < 108) {
+            packetdataserializer.writeByte(this.d);
+        } else {
+            packetdataserializer.writeInt(this.d);
+        }
+        // CraftBukkit end
         packetdataserializer.writeByte(this.e.a());
         packetdataserializer.writeByte(this.f);
         packetdataserializer.a(this.g.name());