Abrupt end with digital freeze: did the last reel get lost?

I've always been irritated about the strange abrupt end of the movie. When Morgan and Carson find Doris Day in the church marrying Errol Flynn, the frame gets an electronical (!) freeze and the film is just over. And this doesn't work like a proper ending but gives you the feeling the movie is just stopping with a whole last reel missing. The story has gone in vain and is over.

But otherwise the contemporary records give no longer running time. So did they just abandon the last pages of the script and stop shooting when the movie reached its budget? At least it's very obvious that there's something wrong at the end and something has been altered in later years for TV and DVD.

Does anybody know more about this issue?