Can someone check if the Holiday Tree Ring throws an exception in this condition?

We're getting closer! Thank you, Slip.

Yes, KMS and KMST offers their own patch files. Somehow, PirateIzzy was able to patch his game to get the latest files. However, the patch files use a new format. How did he patch his game? I'm looking for Nexon code that was used to patch the game because the patch files use a new format.

Sorry, I misunderstood your last question. I don't know much about Nexon code other than the WZ files, but here's the codebase for WzComparerR2 that I forked my repo from:
https://github.com/Kagamia/WzComparerR2

And this was his commit that fixed the patching format for 64 bit:
https://github.com/Kagamia/WzComparerR2/...7ca897df33

Here's my fork of it:
https://github.com/PirateIzzy/WzComparerR2


With WzCR2, go to Tools -> Patcher, select the Patch File and the MapleStory Folder, and then you can patch it.