Doesn't need to be turned on. However it's always possible you mistakenly pressed Esc/Close, didn't read the dialog, or hit a very obscure bug? However this h

Doesn't need to be turned on. However it's always possible you mistakenly pressed Esc/Close, didn't read the dialog, or hit a very obscure bug? However this has worked well for twenty years, so PEBKAC is a reasonable conclusion.