Game Version 1.18.2
lostcities-1.18-5.3.12.jar
I am able to login, but as soon as I try to load a certain area, the server crashes.
I have tried deleting the region files in all surrounding areas, but it continues to crash once I try and load it.
Modpack: https://www.curseforge.com/minecraft/modpacks/no-time-to-die-tech

Crash Report: https://pastebin.com/upM37mUF

Running a pregen test on overworld with just BIOP and Lostcities for 20K x 20K.
Confirmed: Showing lostcities at rarecities and BIOP biomes.

Only change that was made.
lostcities-server.toml
#General settings
[profiles]
#Block to put underneath a bed so that it qualifies as a teleporter bed
specialBedBlock = "minecraft:diamond_block"
selectedProfile = "rarecities"
selectedCustomJson = ""

BTW, don't use generator-settings={"profile":"lostcities_bop"}
That's wrong and only for 1.12

Thanks

Not sure if this helps, but here are some images on the location where I was crashing.
https://www.dropbox.com/s/sb19baozlgzlfv0/lostcities%20crash%20pic%20area.PNG?dl=0
https://www.dropbox.com/s/7dlmrrpr1bw4p23/lostcities%20crash%20pic%20area2.PNG?dl=0

Apologies for the late response. I didn't expect such a quick reply.
Much Appreciated.
I believe that's why my pre-generation keeps crashing at 30ish percent. It seems to be hitting this chunk and then it crashes.

Pre-generation? What exactly do you mean by that? What exactly are you doing?

I also can't remove the mod. I get an error message for incorrect data packs. If a mod causes an issue, I can usually remove it to see if it will fix itself by removing anything that the mod added, but I'm having trouble in this case. Also, I haven't added any data packs.

I removed the config files and let them get recreated so that I could see if that was the issue.
I also have in my server.properties file: generator-settings={"profile":"lostcities_bop"}
I believe that was needed on older versions, but I'm not sure what I would need now in 1.18.2
It seemed to be working well.

I was using WorldPreGenerator-1.18.2-3.0.1.jar but it kept getting stuck at 30 percent.
I gave up on using the pregenerator.
However, today a player entered a chunk area and kept crashing the server with this crash report.
On the command: pregen gen minecraft:overworld 0 0 600
This is for about a 20K by 20 square border.

Weird. Currently I have no idea. Could be some kind of mod interaction. I'll try to look at this soon

The main issue now is that when I enter into the area and load those chunks. It crashes the server.
Please let me know what I can do to help. I work from home and own my own server with a FiberOptic line.
Also feel free to ping me directly on discord. Mimic#4330

Thank you lots for your time.

How did you create your world? Any modification to Lost Cities assets?

No modifications. default lost cities configs.
https://www.dropbox.com/s/krdz60ohia19zm5/lostcities%20configs.zip?dl=0

Just to let you know, I've been pre-generating a world with as many mods as possible that add world generation and I have not crashed even with server restarts. It's currently at 60% with a 20K x 20K. It's possible that I removed a mod and that's what caused it, but that will be incredibly hard to narrow down. I'm pre-generating the world to 100% and then adding all the other necessary mods to my Modpack, but I'll keep an eye out when I remove mods in case this issue comes back. It's just one of those things I guess. I'll close out this ticket once it reaches 100%.