The latest stable version of BungeeGuard isn't updated to fix Spigot compatibility when there is a commit that already fixed this in the development build. That commit is f1e1e9c441421c222ba6c2bd3f4c0be769689556. This should be fixed as soon as possible as people might think the latest stable release works fine when they haven't tested that it doesn't. You can literally bypass the plugin because of this issue. Tested on Minecraft Spigot 1.20.4 if that is any use.
The latest stable version of BungeeGuard isn't updated to fix Spigot compatibility when there is a commit that already fixed this in the development build. That commit is f1e1e9c441421c222ba6c2bd3f4c0be769689556. This should be fixed as soon as possible as people might think the latest stable release works fine when they haven't tested that it doesn't. You can literally bypass the plugin because of this issue. Tested on Minecraft Spigot 1.20.4 if that is any use.