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Issue Description: Dynmap is having black tiles, while they are rendered, chunks are rendered as well. Can't get rid of them in any way.

• Dynmap Version: dynmap-3.1beta7-spigot
• Server Version: SSSpigotClip 1.16
• Pastebin of Configuration.txt: https://pastebin.com/pyMWeku0
• Server Host (if applicable): Syntexxhosting
• Pastebin of crashlogs or other relevant logs: no crash logs
• Other Relevant Data/Screenshots: *
  

I've tried multiple new renders, updaterenders, fullrenders, flying through it, chunkrender etc etc, no succes.

I have a server running with an average of 40-70 people online. Would like to fix this as soon as possible.

Before posting issues you should search for open issues of the same type . Here is a issue that is currently open ands solution #3285

I see that u have 2 red border lines. Is WorldBorder installed and have u made the render with /wb fill?
If yes try /wb [world] fill [freq] 0 true
world = name of your world and feq = chunks per sec
Had the same blank spots on my map and this was the only thing that helped to get rid of them