Interesting, I had forgot about this but now that you explain it does sound familiar (I think someone may have mentioned this regarding PT4 vs HM2 years ago).
Do you have original HH/TS file samples you can use to duplicate this in HM3/PT4? If so please send them to us with screenshots/details of the errors and step by step details of how to duplicate the issue in HM3 that PT4 doesn't have. They both use the same parsing and tournament detection system AFAIK so in theory our devs should be able to make HM3 do it if PT4 can.
Please zip and email the original problem hand histories and tournament summaries to us as instructed
at the bottom of this FAQ.
Make sure you also include screenshots of your reports/filters and a detailed description by tournament number, session, hole cards, filter, stat, etc. of some of the errors we need to test.