Issue Description: Problem with reloading and Delete with command dmap mapdelete

• Dynmap Version: 3.2-beta-1-470
• Server Version: 1.17 git-Paper-46*
• **Pastebin of Configuration.txt:https://paste.hostify.cz/?c44c0058de80cb16#92D7HEMStCzDipVSXCF2rAaBCunQmWtFePh2bp6LWote
• Pastebin of crashlogs or other relevant logs: There is problem with reloading https://paste.hostify.cz/?d24ca8685e5e7458#4QnEHHhcMunZapuuS4nBptUK3BfsxTgBS846wB5mxNma
• Steps to Replicate: I write command from console and game, dynmap pause all, and now when rendering is disabled i send dmap mapdelete world_nether:surface and dmap mapdelete world_the_end:surface no working. on dynmap still maps exist and still same when server is restarted

There is same issue with reloading command but in ver for 1.16.5, still no fixed #3377

Dupe of #3350