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Issue Description: Divs from other plugins are not getting "injected" into dynmap properly, a div like (div id="something") is returned (div) in the browser, unnamed.

• Dynmap Version: 3.1 beta 3
• Server Version: paper 1.16.1 build 92
• Pastebin of Configuration.txt: https://pastebin.com/1RVDngN1
• Server Host (if applicable): TitanNodes
• Steps to Replicate: From a plugin like Kingdoms X or factions (happens on both), the divs in the config files end up unnamed in the browser.

KingdomsX config: https://i.imgur.com/y77L4f4.png
Result in browser: https://i.imgur.com/1l4wFoU.png

After reloading Kingdoms and Factions, the div gets injected properly in the dynmap, this is how it should be:

https://i.imgur.com/h72vQKn.png

But after reloading the browser, the div is bugged again

https://i.imgur.com/1l4wFoU.png

This is not a bug with KingdomsX or Factions as this happens on both plugins and this was NOT happening in old versions of Dynmap. (MC 1.11.2 Dynmap)

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

As the dynmap plugin updates things that modify the plugin will need to be updated too.
This is an issue with both of those plugins as they will need to be updated to support the dynmap update.