I have noticed that the object IDs of the notes change from time to time.
Example: During the course of its lifecycle, the same note has already had the following IDs:
joplin://x-callback-url/openNote?id=e11ce29a76ab447fae4c213c8085f2e8
joplin://x-callback-url/openNote?id=639c6cae84b64c6ca1371360097c4c0a
joplin://x-callback-url/openNote?id=6d7a269cd92e4abc8e3fd0ce8983ab19 - 2025-01-17
joplin://x-callback-url/openNote?id=5adb47e2784443cda399be59fbb21959 - 2025-02-02
The last change could be related to the fact that I exported my data to a JEX file and imported it into a new Joplin profile.
Jack's answer fits with my observations.
I think we don't need to follow this up any further at the moment. If I ever get the impression that an ID has changed without a JEX being reimported, I would open a new topic about it.