Issue Description: Waterlogged barrier blocks are not rendered correctly. The barrier blocks and anderlaying water are rendered as air instead of water and therefore not visible on Dynmap..

• Dynmap Version: Dynmap version: core=3.7-beta-2-923, plugin=3.7-beta-2-923
• Server Version: Paper 1.20.2 #318
• Pastebin of Configuration.txt: https://pastebin.com/yf4QCCFZ
• Server Host (if applicable): Selfhosted (If I'm correct)
• Pastebin of crashlogs or other relevant logs: No special logs available
• Other Relevant Data/Screenshots: In this example only the sides are covered with waterlogged barriers, the top is normal water. Screenshot game: https://prnt.sc/NXqjWqJCAASa - Screenshot Dynmap: https://prnt.sc/_mlvu7Dnd1Pv
• Steps to Replicate: Create an aquarium with some waterlogged barrier blocks as top and at the side and let Dynmap render the tiles.

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