You're right, and I don't know how I managed to get it to display properly before. I can't see how it would be possible. The closest thing is this:
Next Break: <nextBreak format="H">our(s), <nextBreak format="M">inute(s)
The issue is that there's no space between the numbers and the words:
Next Break: 1hour(s), 13minute(s)
That's the best I can get it.