Issue Description: Player editted chunks are turning black in both flat and surface view.

• Dynmap Version: 3.2-beta-3-514
• Server Version: Paper 1.16.1
• Pastebin of Configuration.txt: https://pastebin.com/AR94Hk6y
• Server Host (if applicable): Self-hosted
• Pastebin of crashlogs or other relevant logs: None.
• Other Relevant Data/Screenshots: View on https://earth.manacube.com/
• Steps to Replicate: Launch Dynmap, edit chunks, wait a while, chunk renders as black on the map.

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

Feel free to contact me on Discord at Boomclaw#7788 if you'd like to investigate closer.

Your config has removed the 'chunkgenerated' render trigger - this is what happens when you do that. See

https://github.com/webbukkit/dynmap/blob/v3.0/spigot/src/main/resources/configuration.txt#L303

for the default triggers