I'm playing a modded minecraft server and there was a mod that expanded the end. What I did was reset the end dimension so that when travelling to the end cities, there would be new end biomes since the area has been explored before. However, upon resetting the end and getting into the end portal, there are end crystals but no ender dragon nor bedrock blocks of any sort. I don't know if this is because of mods, because the end and its city worked previously with mods, but after the first end reset, the end did not work. I tried removing the end mod and restarting the server and the end, but no luck.

It affects forge 1.16.4, to recreate, have a server and reset the end with mods, I guess?