>and for whatever reason AI generated music replicates this.

Its within the training set I believe. The AI is being trained off compressed audio

I was listening to a podcast last year (forget which, or I'd attribute credit) and one of the tells AI researchers look for when trying to determine if music is AI generated or not is the compression artifacts. AI likely has gotten better at hiding it since then, but AI would include compression artifacts on the final product because of the prevalence of it in training data.