Fixing the mistake yourself and then sending the code back is a positive example, since you're demonstrating the correct way rather than asking for a fix.
But in my experience, if you continue iterating from that point, there's still a risk that parts of the original broken code can leak back into the output again later on since the broken code is still in context.
Ymmv of course and it definitely depends a lot on the complexity of what you're doing.
