My answer is always this. If I write a line of code, discover a bug, and fix it right away, it's part of the normal coding process and covered by the hourly/dai

My answer is always this. If I write a line of code, discover a bug, and fix it right away, it's part of the normal coding process and covered by the hourly/daily rate I've quoted the client. What difference does it make that the bug was found later or by another person?