The thing about updates is that the code QA engineer may see something that's not right and fix it without bothering to document the fix. Or, even if documented in the engineering reports not published as part of the change log, because its too minor. I've seen that a lot.
One reason I always update my cameras and the gear to latest firmware whether the documented updates are important to me or not.
Agree. Clandestine patches aren't that unusual.





