RandV
It's a wolf v2.0
Yeah, the tracking device has me overthinking things way to much but some sort of small explanation with how they work could go a long way. But I don't see how you could even explain it at this point.
I only watch these things once but I'm pretty sure the 'explanation' is in there. If I recall correctly in episode 1 it was mentioned it's tied to a 'bio signature' (that's the vague sciency part), but the trick is you have to be in close range for it to work. So you can't scan it from space, you have to be on the ground in the vicinity for it to work which is why they thought Baby Yoda would be safe there. But once discovered - not unfeasible someone may come by to check what happened to the raiders and has one of those trackers, or was specifically hunting for them checking out potential hiding backwater hiding places and got lucky.