Pl3xMap VS ViaVersion

Try restarting the server to see if it works or not. The error seems like it's just struggling to save a region. Some quick research showed that plugin is discontinued. You can read this to find out where you can ask for support. I also recommend you post large errors to a pastebin next time

they might be using Pl3xMap (archived) or BlueMap

Pl3xmap is a really great lightweight web map, has addons with grief prevention so you can see claims!

I am running a 1.18 Paper server and want to implement a worldmap. I decided upon Pl3xmap due to how optimized it is, and I believe it functions similarly to Dynmap on a networking level. I have a dedicated game server from OVH. I followed the plugin's setup instructions exactly, and made sure to add a firewall exception in the OVH panel, and allocate port 8080 to the server in Pterodactyl. Despite this, "0.0.0.0:8080" (pretend the zeroes are my IP) does not resolve to the map in browser. Am I missing something? sudo lsof -i -P -n | grep LISTEN shows that the port 8080 is indeed open for the process "docker-pr".

You could use something Pl3xMap it has fewer features than Dynmap but it's more lightweight

Try this plugin out: https://github.com/pl3xgaming/Pl3xMap

Anyone who has checked out both Bluemapand Pl3xmap what is your preferred option?

Dynmap supports spigot (plus all forks of spigot), forge, and fabric. So on vanilla, sadly no. If u want another alternative to dynmap (it's a plugin), try this plugin here

I used to use bluemap as u/Hackerv1650 suggested - but I run on PurPur (fork of paper) so I opted for Pl3xmap instead - much lighterweight and still minecrafty.

ViaVersion: Download ViaVersion

ViaVersion: ViaVersion is a plugin that allows players to join your server with newer or older versions of Minecraft. It supports most features and protocols from 1.7 to 1.20.1. You can download ViaVersion from here and join their Discord for support here.

I think the only way to totally accomplish what you're trying to do would be with a server rather than a realm. You could run a 1.16 server with ViaVersion to allow newer versions of Minecraft to connect to it. I believe that this would maintain 1.16 world generation even when generating new chunks.

Okay turns out there IS a mod that seems to do exactly this. I haven't taken a close look at this yet but this seems like it would do what you want. https://github.com/ViaVersion/ViaVersion

https://github.com/ViaVersion/ViaVersion.