1.12.3 released here
https://github.com/TreeOfSelf/CarpetSkyAdditions-Reborn/

Question: How much AI was used for this? None I hope, being something that someone else has mentioned.

That is a very, very poor question. Not only on the basis of, of course not, how would an LLM magically train on a brand new Minecraft update, but also on the basis of... you really care what tools someone used to make their completely free, completely open-source, completely open licensing mod? Genuinely taken aback that someone would care.

If I could have just put all the source code into ChatGPT, and it gave me the latest version indistinguishable from the code now, let's just pretend that was possible, you are saying it would actually be preferable for a person to have made it by hand....? I'm trying to understand that, is it because you feel there's some inherent artistry behind coding that AI takes from? Does it strike a nerve with your fear of AI replacing people working coding jobs? Really, I just can't wrap my head around who is the victim in that scenario.

Oh, I was simply asking because someone else was making the accusation; not me. I didn't believe it myself, so I just had to clear the air and find out for sure.

I looked at the code, and don't think that AI could do such a thing at all. Maybe the only thing that I've taken notice to is some of the documentation hasn't been fully updated; but that really is just splitting hairs.

Anyways, I may actually consider starting a Skyblock world now that this has been updated; thank you.

Oh alright, didn't mean to take it as an attack if it wasn't. This mod is just an update to carpetskyadditions released so other people can have fun with it, after updating for my own purposes. And of course, the mod also credits jsorrell completely and is only meant as a temporary mod when/if he returns.
Enjoy.