No problem - though I think you solved it more yourself.

What a legend! I thought its incompatible together! Sorry for spam and thanks for help!

Yes

Do you use Idea groups expanded and trade goods together with AB?

No problem! Im happy you managed to figure it out!

You dont need to do anything before clicking the RNW button.

If its a help I use this with:
Chewy's Graphics
Gutman's Shield Frame
Idea Groups Expanded 1.33
Trade Goods Expanded
This work for me together with this.

I've checked one by one mod now, it seems like Roshar crashes, but Ante Bellum - Monuments unlocked is uncompatible with this collection, thats why some provinces were broken, sorry for trouble!

Its the same issue - empty provinces - I had when trying to use the mod with the Map Borders Overhaul mod. None of the files clash - there is no file modified by both. Yet they somehow dont work together.

I also dont understand why my standalone Roshar, Ulthuan or Westeros dont work properly with this. I updated them by practically copy pasting the files from my Middle Earth tile and only changing the appearance probabilities of Middle Earth and Roshar, Ulthuan and Westeros respectively. They do work when I use them - except with this mod. But Middle Earth does....

Outside of tile making (that i have been doing for a while) Im quite inexperienced at modding. Im sorry I would really like to help but I have no idea whats causing the issue. I guess its one or more of the mods you use - but as I dont see the logic in whats the problem I cant help you. I also dont really use those mods.

So basically when I load EU4 with all my mods I will see some weird provinces not controlled by anyone - Vidin for example, then after I load RNW it crashes ofc. I tried turning off these 4 mods and everything worked perfectly, even these provinces. Seems like I have some mod that changes provinces, but I really dont, I have checked my playlist like 20+ times. Is there anything else except mods with new provinces or colonial stuff that can cause incompatibility?
I havent played RNW mods for years now, should I just click the button RNW or there is something else I need to do before creating RNW, like changing settings or anything?

I checked using the same loading order you used 10+ times with different tiles of mine and it crashed for me 1 time using Naggaroth - I repeated it without change and it worked that way as well. (Though I would note that Unique New World Colonies I never tested with Ante Bellum before this and im not sure if it will contain any bugs)

About other mods: I can only say that theoretically I dont think that this should clash in anyway with the map borders overhaul either - yet it somehow does.

On the other hand i did discover that the separate Ulthuan, Westeros and Roshar tiles dont work properly with this. They should be guaranteed to spawn yet they dont - no CTD just different RNW's. Middle Earth, Naggaroth and Tamriel work properly. I also tested roshar, and Ulthuan without Ante Bellum,and they do work properly. As of now I have no idea whats the reason behind this.

1) AB
2) Flogi's RNW Adjustments
3) Flogi's RNW adjustments for Ante Bellum
4) RNW Tile: Roshar
5) Unique New World Colonies
Is this right order? It crashes as soon as it comes to 6/6 RNW creation, did I miss anything? I tried turning off other mods but most of the other mods are just changing defines or music mods

Thank you! :)

Sa basically we can colonize Ulthuan in Ante Bellum?! NICE!