ul and il attributes not preserved with getSemanticHTML

I have a list of the form which looks like this in the DOM but when calling getSemanticHTML(), it returns `'

1. a
2. b
3. c
   1. a
   2. b
   3. c
      1. a
      2. b
      3. c

'` (i.e without the data-list='ordered', etc....) is there a way around this?