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Issue Description: The Bukkit and Forge versions of Dynmap have some functional discrepancies, the Forge version loads modded block models/textures from dynmap/renderdata but the Bukkit version doesn't seem to load them from plugins/dynmap/renderdata, perhaps assuming it's vanilla MC?

• Dynmap Version: 3.7-beta-10
• Server Version: arclight-forge-1.18.2-1.0.12
• Pastebin of Configuration.txt: N/A
• Server Host (if applicable): GNU/Linux VPS
• Pastebin of crashlogs or other relevant logs: N/A
• Other Relevant Data/Screenshots: N/A
• Steps to Replicate: Please be clear in this section so we can replicate your issue

So I am running one of those Forge+Bukkit hybrid servers called Arclight. But this issue is not related to server software.

As a result of #4073 (Sign markers are not implemented in the Forge version), I tried to migrate Dynmap from the Forge version to the Bukkit version in hopes of enabling this feature, since my server supports both sets of APIs. But after this migration, modded blocks starts disappearing from the map as the tiles update. Does the Bukkit version load renderdata at all?

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