Issue Description: Dynmap only renders flat images, if you try to render 3d images, it doesn't generate anything and instantly finishes and reports that it's "done"

• Dynmap Version: Dynmap-3.7-beta-8-spigot
• Server Version: [18:16:37 INFO]: Current Purpur Version: 1.21.4-2416-51aafbc (MC: 1.21.4)
• Pastebin of Configuration.txt: https://hastebin.com/share/viheruzasa.yaml
• Server Host (if applicable): Self Hosted
• Pastebin of crashlogs or other relevant logs: https://hastebin.com/share/opuzamusub.markdown
• Other Relevant Data/Screenshots: I'm using this texture pack and these plugins and my map is from alpha .8
• Steps to Replicate: Try to full render a 3D image of any world, and it will finish instantly and claim it is done.

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