Hello,
I'm using the latest version of the mod for 1.17.1, while Idling a player noticed I was visible in-game but not in the tab list.
I have a few other mods but none that should interfere with network packets.
I'm using Fabric API version 0.40.0+1.17

Mods list;
LazyDFU
Lithium
DimThread
Starlight
NotEnoughCrashes

No errors in the console.

Since my username is known on my server, If you need specific details, such as a screenshot, it would need to be in some form of privacy.