Issue Description: When Suspicious Gravel is rendered, it shows up either black or invisible. Suspicious Sand is being rendered correctly:

• Dynmap Version: core=3.7-beta-2-923, plugin=3.7-beta-2-923
• Server Version: git-Paper-318 (MC: 1.20.2)(Git: 9271ee7)
• Pastebin of Configuration.txt: https://paste.helpch.at/pewikoloti.yaml
• Server Host (if applicable): Selfhosted (dedicated server)
• Pastebin of crashlogs or other relevant logs: n.a.
• Other Relevant Data/Screenshots: Resource pack: lom.zip
• Steps to Replicate: Place Suspicious Gravel and render it

[ x ] I have looked at all other issues and this is not a duplicate (Did a search for "Suspicious Gravel")
[ x ] I have been able to replicate this