Netlify redirects don't work if slugs have underscores

In our _redirects file, whenever we try to redirect from a slug containing underscores, the redirects don’t work.

For example, we’re trying to redirect this page:

to:

using:

/books_for_learning_Japanese.cfm /books-for-learning-japanese/

Why isn’t this working?

Hey @donovan,
Unfortunately, this looks like a bug in how we process redirects. I’ve filed an issue internally and we’ll let you know if/when there’s movement on this issue.

Actually! Quick followup question: in digging into this, I am seeing that if I force a redirect from a path with an underscore, that seems to work. Can you please share an example redirect rule for one of your underscore paths?