To correctly install the map, add the map's workshop ID (1850209768) inside the square brackets of "File_IDs": [] in the WorkshopDownloadConfig.json file. Doing this in any other way may cause rubberbanding and other issues.

If you are still experiencing problems, add "misc.dont_enable_this true" to Execute.config. This will disable unturned's anticheat (VAC and Battleye will still be active) and should remove the rubberbanding issue completely. I don't reccomend doing this on a public server but if you are playing with friends, I highly encourage it.