Then it's not .nomedia but some Mac specific file. I can't recall what it is since I stopped using syncthing on my Mac haha. I rarely use it unless I kinda have to.
IIRC, MacOS is well known for leaving .DS_Store droppings absolutely everywhere. If you ever shared a pen drive with a MacOS user, it would come back full of .DS_Store junk all over it. It might be that one you're recalling.
Run these both in Terminal, and either restart Finder or just reboot. Should solve that problem.
The whole point of those files was to store Mac-related metadata (such as icon positions and other stuff) that the filesystem in question did not have the capability to store, to preserve Mac users' expectations.
