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Issue Description:
We have the problem that our dynmap constantly reloads and does not stop.

The dynmap is running in a pterodactyl container.
The folder for the web files is defined to /dynmap which is a symlink out of the container to our /var/www.
We're having 2 servers, each of them has a dynmap which the same configuration and a symlink to
Our Server "Themona" works perfectly with the dynmap, but our Server "EONA" not.

What have we already tried?

• Copy config from Themona to EONA and restart EONA.
• Restart host system
• Delete everything and full-render
• Clear Cloudflare cache and create rule for cache bypass
• Use other browser, use cell phone
• Attached cache control headers via Apache

Here some links to the maps:
General: https://dynmap.eona-minecraft.de/
EONA: https://dynmap.eona-minecraft.de/eona
-> Symlink /dynmap => /var/www/XX/eona -- configHash problem
Themona: https://dynmap.eona-minecraft.de/themona
-> Symlink /dynmap => /var/www/XX/themona -- Working

We've added some debug output to the map.js, where the reloading thing happens.

                                if(me.options.confighash != update.confighash) {
                                    console.log("configHash problem!");
                                    console.log(me.options.confighash + " != " + update.confighash);
                                    console.log("me.options", me.options, JSON.stringify(me.options));
                                    console.log("update", update, JSON.stringify(update));
                                    debugger;
                                    window.location = me.getLink();
                                        return;
                                }

Here is the result
configHash problem!
-645971886 != -645971893
me.options: https://pastebin.com/1vNgBGpz
update: https://pastebin.com/gq2S8ayP

• Dynmap Version: core=3.6-899, plugin=3.6-899
• Server Version: git-Paper-407 (MC: 1.19.3) (Implementing API version 1.19.3-R0.1-SNAPSHOT) (Git: 8c4e811)
• Pastebin of Configuration.txt: https://pastebin.com/5SETL3z2
• Server Host (if applicable): Netcup
• Pastebin of crashlogs or other relevant logs: There is no crash or something
• Steps to Replicate: We cannot provide that information, bc we don't know how to reproduce it for others.

[ ] I have looked at all other issues and this is not a duplicate
[X] I have been able to replicate this

There are other duplicated and closed issues like: #1726 or #1546
But none of them could provide a final solution for this.

The dynmap_world.json file got not updated the whole time, I would say this is the main reason for the problem.
You can compare both files and reload after a few seconds.
https://dynmap.eona-minecraft.de/eona/standalone/dynmap_world.json
https://dynmap.eona-minecraft.de/themona/standalone/dynmap_world.json

The question here is, why does the file not going to be updated?
I deleted the configuration.txt to let them generate by the Dynmap plugin.
I modified the configuration to use /dynmap as web-folder and enabled "JsonFileClientUpdateComponent".
-> https://pastebin.com/YmfxRXPr
But this does also not work

The web folder conents got generated, also the dynmap_world.json.
But the dynmap_world.json itself doesn't get updated.
But now, I get some exception from the dynmap about the maptype: https://pastebin.com/DAW0rsKc

Here is a little overview about our architecture with the symlinks.

Are there any logs in the nginx webserver logs (/var/log/nginx/error.log)?

Are there any logs in the nginx webserver logs (/var/log/nginx/error.log)?

We're using apache2
Access-Log: https://pastebin.com/LGDvc0yY
Error-Log: https://pastebin.com/xbhVKibk

Looks like either some files didn't get copied over or it has no permission to read them

A few minutes before posting the logs, I tried to open the dynmap.
The error logs you see doesn't rely to this current problem, bc it was way before 10:00 AM

In the access logs, you'll see logs from today 10:53 AM, this was me.

It seems like there is a problem with the dynmap_world.json.
It is the same as yesterday, at least the configHash
Should this file being updated in a specific interval?

The symlink itself is working, I've added some files in the Pterodactyl container under /dynmap,
the files were accessible via the website.
https://dynmap.eona-minecraft.de/eona/test.html

yeah I think the confighash is updated every set in configuration, if your proxy is not that fast, it might fail, but this is not tested, just guessing here

If one works and the other doesn't, check for any config changes in between those, maybe the file permissions are different so Dynmap cannot write

no update so assuming fixed