The only way that's likely to happen is if the bug-fixing was performed directly on the program binary itself without reference to the source code. This is a difficult task to pull off.

Find out how source code is compiled for different programming languages and computer architectures, including the evolution from FORTRAN to CLR and JIT compilers. Topics Spotlight: New Thinking ...

An executable program written for the operating system and hardware that it runs in. For example, a Windows application is written to interface with the Windows OS and the x86 machine language.