@Escapanada
Some GCMS notes get delayed, and most of the times there are two reasons:
1. administrative delays - IRCC just keeps sitting on the requests
2. If the application is at the final stages. Here, IRCC will prioritize the approval of your application, over the release as many entries are made during the final stage.
But, all GCMS notes are eventually released. If you requested your notes through GET GCMS, they have a protocol that they follow and will ensure that all notes are released, unless expressly barred by law, which is the rarest of rare case.