That's interesting! I have a similar experience but for the opposite reason. I like the book and have enjoyed reading it several times, and listened to the audiobook just before the pandemic.
I know I like it and consider it to be a good book, but every time it's like I'm reading it for the first time. I can only remember thew "mood" so to speak, nothing about when, where, who, what. Even now, just 5 years after the last time.
I think it is related to Gibson's prose, but I remember Pattern Recognition quite well despite having read that only once.
Neuromancer is just a complete blank, except I know I like it. Wonder if anyone else has had a similar experience with a book?