The only Guerlain I can think of with aldehydes is Liu. Mitsouko is known as the Queen of Chypres and for many is very hard to wear. I found this out years ago on a perfume forum, so many said they just could not wear it, I love it and Shalimar. Nahama was my just do not go there from Guerlain, I bought back in the 80s and wore. A friend used to tell me it was very heavy but I wore it anyway. Then some years later tried it again from a tester and realized she was right it did not suit me at all.
My big shock was No5, I remember buying it in parfum and just hated it so avoided it like the plague for years. Then earlier this year I bought a bottle of Annick Goutal on eBay the seller was in Dublin and it was a great price. With it as a freebie she sent a half 50mls size of No5 EDT, my first thought was giving it away. Then decided to actually just try it. WOW! It is lovely all powdery and aldehydes, so I should have tried that version all along. Seems No5 is different in every version and not just a weaker version. I kept it.