That’s a tricky question. In some way, an unintentional error being corrected later makes sense. Especially since something like a sound effect doesn’t change the plot. It’s sort of akin to using digital effects to remove visible wires from model-based space shots.
But where does it end? I don’t know if I have a good answer.
Sometimes I like to make up headcanon to justify mistakes for fun. For instance, maybe the paging system on the Defiant blew out on a mission and O’Brien had to wire in a Cardassian chime temporarily while he waited for a new part to get ordered.