Most likely it was not a sensor/CMOS artifact. Because it appeared on multiple cameras and in video, the cause was probably in the scene or in the optical path from that one location.

The strongest explanation from the community is an aircraft contrail or wake crossing the line of sight to the moon. The line looks uneven rather than perfectly uniform, and the fact that only one shooting location recorded it fits a localized atmospheric/object-in-the-distance explanation.

A secondary possibility is an optical effect from the warning beacon/lens at the rocket tip. A cylindrical protective lens can refract or diffract bright light and create a line-like flare along one axis, especially with the moon aligned closely behind it.

So the best answer is: it was probably a contrail or aircraft wake, with a beacon-lens diffraction/refraction effect as another plausible explanation. It is unlikely to be a DSLR/CMOS readout issue, since different cameras saw the same thing.