In Bug 120028 filopen of PPTX shape text with multiple columns was fixed, as seen for attachment 145086 [details] in attachment 145798 [details].
What remains and is a follow-up is the issue with 3 columns that can be tested with PPTX attachment 145366 [details]. Look is not the same as in MSO.
I'd say "minor". Although backported, I'll set from 6.2.
May need more detailed looking into shape type and size, for not being a duplicate.
SEtting this to NEW