I never heard or saw a sound notification every time a survivor was taken off the hook during my match.
Also certain sounds echoed several times, I believe it was a generator being completed.
I'm experiencing the same issue.
This feels like a secret game change rather than a bug.
It's a bug since they wouldn't do this and i've known for quite some time generators popping blocks unhook notification sounds. But then i always pay attention to the status bar playing either side.
This is PTB, do not pay attention