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Issue Description: Dynmap sample issue description. This description would include as much and as little detail necessary for us to understand the issue in its entirety.

• Dynmap Version: Dynmap version: core=3.4-SNAPSHOT-790, plugin=3.4-SNAPSHOT-790
• Server Version: paper 1.19 build 32
• Pastebin of Configuration.txt: here
• Server Host (if applicable): Selfhosted
• Pastebin of crashlogs or other relevant logs: here
• Other Relevant Data/Screenshots: none.
• Steps to Replicate: Please be clear in this section so we can replicate your issue
• create a line using the /dmarker addcorner 10 0 0 world command
• add a second corner using /dmarker addcorner -10 0 0
• create a line marker using /dmarker addline exttest
• try to update the position using /dmarker updateline exttest corners:"{ {-10.0,0.0,0.0} {10.0,0.0,0.0} }" command
• dynmap outputs a seemingly succesfull command processing, but the line never actually updates.

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