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Issue Description: Dynmap has been rendering for a few days and normally I can restart the server and it would just continue but today it stopped and /dynmap stats shows zero progress and render is not continuing...
Is there a way for me to get it back on track?

• Dynmap Version: Dynmap version: core=3.2.1-531, plugin=3.2.1-531
• Server Version: Paper version git-Paper-381 (MC: 1.17.1)
• Pastebin of Configuration.txt: https://pastebin.com/LNeUj62a
• Server Host (if applicable): BloomHost
• Pastebin of crashlogs or other relevant logs: None
• Other Relevant Data/Screenshots: None
• Steps to Replicate: Unknown

I think the quick answer here might be "no" - you could try running "/dynmap fullrender resume " or "/dynmap updaterender" both of which should only target tiles that dont need updating.

Yea - server stopping suddenly or crashing or rebooting too slow might kill the dynmap process where it cant recover.

Let us know if its re-occurring, close when youve got it fixed up

A crash is a crash - we don't save progress transactionally, because it would kill performance and generate unneeded file I/O. MC loses chunk updates since the last 'save-all' under the same conditions, so integrity at that point is suspect anyway....

@mikeprimm - for my later wiki edits, is there a way to force a save of the progress (or is it just 'pause all' or a clean shutdown), and what is the best command to kick things back alive if any