Try typing Instance:Script into the Explorer Search bar at the top of the window.
This’ll find any scripts in the workspace or other services, even if they’ve been renamed.
I’ve already done that, I believe the [Unknown] script is a Core script because it also appears on a empty baseplate, I don’t think it has anything to do with the KB/s spikes.
Still happening for me almost 6mo later. In addition, server memory also goes up and stays up (without ever going down) and this causes leaks and overtime server lag for longer servers.