Just had this fault (Fault: electronic child lock) on Skoda Superb III 2019 after low/faulty battery. Replaced battery and had it recoded, but fault still there (everything physically working except switches on driver's door did not light up when child lock activated). Tried clearing fault codes via "man that can" - there were low voltage codes that were cleared but the child lock fault kept coming up. Had to take it to main dealer who reloaded the vehicle software - presumably updated software and fault now disappeared (also lights on driver door now working correctly). Obviously no fault with the door locks, or they would have charged me for those as well, if they could!
Said that if it was under warranty it would have been free, but I had to pay £180 for an hour of "diagnostics". I'll be banging the table harder if it happens again because of a flat battery!!