This has been going on for a very long time. I gave up posting on it years ago. I don’t think it was ever really resolved but I double check any Debussy imports as I still find mix-ups between the two L numbers and the CD number. Here is thread from six years ago:
Debussy is not an isolated case. Bach, Poulenc, Telemann, Bruckner also come to mind but there are others. It seems to effect composers where the cataloguing rules are not simple or straightforward and there are special cases. I have been fixing this manually as I have been going along for probably 7 years or so and don’t bother keeping records or reporting issues any more. I suspect those with largish libraries have more composition miss-matches than they realise, often of quite famous works.