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Did you run the tape to it's physical end or just the end of the recorded part?
How the deck knows to stop on rewind is that the black tape material has a clear plastic leader tape at the beginning and end. The deck will try to shine one or more light sources through the tape to detect the leader to know when to auto stop. Older decks the light is visible and incandescent, but most S-VHS era stuff uses IR light. If the light or phototransistor is bad auto stop won't work (though that often causes other issues).
The unrecorded portion of the tape is supposed to play back as noise until it hits the transparent leader tape at the end. Heck if you buy a brand new blank VHS recording tape and pop it in it'll play for a few hours (depends on length) as static until you hit the leader.
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