Are you using Little Snitch on a Mac with Syncthing? Are you having any issues? Please post here.
For me: i) auto-upgrades do not work: if the Mac is being used while Syncthing is being upgraded, it does not prompt to allow/deny network connections. Manually updating does force the prompt. ii) occasional local discovery log messages (https://github.com/syncthing/syncthing/issues/1155)