> Any sample photos we can try to reproduce these errors.

This suggests you are a maintainer or author of the tool you recommend over exiftool. Your other two comments are written in a way to suggest a disinterested preference. Which is it?

1. I did not "recommend" exiv2. I stated that I prefer it.

2. As an occasional exiv2 user, I am interested to know if and where it fails.

3. exiv2 is written in C++. I prefer C. I am not an author or maintainer of exiv2.

Hope that helps.