Issue Description: dragon head is rendered as creeper skull in the end

• Dynmap Version: core=3.1-beta6-438, plugin=3.1-beta6-438
• Server Version: paper 1.16.4 build 416
• Pastebin of Configuration.txt: https://pastebin.com/aJrXTjy0
• Other Relevant Data/Screenshots:
• Steps to Replicate: generate an end-world and look at the end ship

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

@mikeprimm bump on this issue as well. Still present in beta3