Possible Fixes

Yes

Modpack Version

0.2.59

What happened?

Normal ancient cities not spawning, went about 18k blocks in 3 of the 4 cardinal directions, limited distance due to lag, and used the locate command. Repurposed ancient cities did exist but did not have the crafting materials expected in standard ancient cities.

Server is being run with all default configs for the server files downloaded as a bundled ATM9 server pack.
Vibranium and other areas and elements seemed to be present as expected.

Server was wiped and recreated and, despite players losing their structures and such, at least 1 ancient city did appear. Server did not have any additional mods added. I can't seem to narrow down what caused this or if the potentially there were ancient cities significantly further away, though the lag at the explored areas was already starting to impact all players.

I apologize if this isn't an issue specifically with ATM9 but I did my best over a few days to try to figure out what caused the issue and to recreate the issue.

Edited for clarity and additional information.

latest.log

No response

Developer reports

No response