It can be fun, it just depends on who you are. Sadly most developers prefer to follow PM and churn in features instead of this precious work.

I actually enjoyed a maintenance project I was on. There was less time pressure. Finding and fixing a bug is a logic puzzle in its own right.

So things can be largely a question of perspective.

I actually love chasing down other people's bugs. I often get to fix other developers new shiny features shortly after they've hit production. And I love the challenge.

It's also nice that bug chasing has less of an expectation of giving good times estimates, which the software industry is famously poor at anyway.

Well, if it were fun, it would lose its shine if you're constantly being told it doesn't matter to the business.