hi, I've created the world in minecraft before installing the mod. after installation, I optimized this world and placed the "dimensions" folder from the world in which cities were generated in the folder with that new world. there were few loaded chunks, so I flew thousands of blocks forward, butI I still haven't seen a single building. is there a solution to the problem?

First, what version. Then what exactly did you do? Can you describe the steps? Did you confirm that in the first instance the dimension did contain cities?

game version 18.1. first I created a world in a singleplayer where the mod worked (i.m. there were buildings), then I transferred the folder with its generation of the world (called "dimensions") [UPD: at least I hope it's a generation folder] to the world with the server. the configs show that the mod works and is readable for the server, very few chunks were downloaded, but still there was no spawn (or it is possible that there will be several thousand blocks ahead, but I did not check)

the generation of the world is "default", but there is still a folder with configs of mod