Despite modern quality control processes they are still far too common. Keep the PCB artwork around as a reference, so you can see where the tracks run when it's time to fix a short or a design problem. Often a new design suffers from a problem you just KNOW you can cure by grounding a signal. The ground end will be at ground, for sure. The signal end may not look much different than without the clip lead attached.
Edges are so fast now, even in slow systems, that wires no longer act like wires.
Solder a short very short run to ground, perhaps using a discarded resistor lead. I have found that grounding via a clip lead now only works on DC signals. Sigh in the good old days of slow systems a mountain of clip leads were a troubleshooter's best weapons. Now look warily at that mound, realizing that a wire is not a wire. Use all of your tools.