Per Version Folder

When a server is created it will automatically create the run folder. If no custom path folder is selected, you can enable the generation of version sub-folders, e.g. run/1.21.4/spigot.

By default, this option is set to false. You can modify this by adding perVersionFolder(true):

runServer {
    minecraftVersion("1.21.4")
    perVersionFolder(true)
}