While the legacy version of KR-2042 b Scriptable Control System is hidden in the VAB and SPH, it still appears next to the newer version in the list of parts that are unlocked in the Precision Engineering tech node. This may (I didn't test this) incur a separate part unlock fee if a player uses the button on the tech node that unlocks all the parts in the node, in games where it costs funds to unlock individual parts.

Taking a cue from stock parts that have been revamped in recent game updates, this can be remedied by adding TechHidden = true to the main PART object (immediately after TechRequired seems like a good place). While we're at it, we might as well change category = -1 to category = none for consistency with legacy stock parts.