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Issue Description: *renderdata and custom folders do not work.
What I tried:

1. Introduced DynamapBlockScan-3.0-SNAPSHOT-forge-1.12.2.
2. Move the generated txt from modsupport to renderdata and custom folders
3. Reboot the server
4. Perform full rendering*

• Dynmap Version: Dynmap-3.1-beta7-forge-1.12.2
• Server Version: CatServer-26208f0-universal（Forge2854）