Tuff Brick Walls invisible on isometric view

[Bioniclekolacz]

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Issue Description: Tuff Brick walls do not appear on the map. Walls made out of it are completely invisible. Polished Tuff walls DO appear, just not tuff brick walls.

• Dynmap Version: *3.7 beta 7
• Server Version: paper 1.21.4 build 31
• Pastebin of Configuration.txt: https://pastebin.com/05wHBNJ7
• Server Host (if applicable): Bloom
• Pastebin of crashlogs or other relevant logs: no crash logs
• Steps to Replicate: Place tuff brick walls, look at dynmap

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