Unfortunately i didn't test what would happen if i had Hana with me when i go to beat Ilfang, i did see the extra dialogue with N'Gombe because i did go immeadiately to Shilai to get her after i dealt with Illfang.
Also, here are some bugs in 3.1 version i have found.
First, some game crashing bugs:
-Horunka village's inn bard second talk with Hana on party gets a bug (didn't test if you can listen to him for the first time with her or the second time WITHOUT her)
-If you try to enter the cave between Urbus's mountains and the mute guard.
-Some BGMs crash the game because their name are wrong in the archive (i basically changed an _ for an ' in the file name and it fixed the problem), they are the following:
Florana's Happy, Florana's Fairy, Slenderman's Lullaby, Sorrow's Cessation
Now some non-renderized maps i found, didn't explore the Imperia Academia yet, i remember finding some of these there.
-N'Gombe cave
-Illfang's forest
-Port (you can cross the fence here, very old one btw)
Now, some system problems i have found until now:
-Can't enter Blackcry
-Can't access the Stingy Path fromTolbana (the path is missing), can access Tolbana from the Stingy Path, but the MC appears in the Urbus path at the north.
-Pouring blood at the angel fountain don't give any status bonuses whatsoever, even if you already have a member on your party.
-The Self-made martyr perk don't work properlly (MC don't cover for his low health teammates, have yet to test the majority of the perks)
-Can't read the sale note for house in ToB, can't buy it in anyway because of this
-Confusing an enemy instantly make him stop bleeding (tested a lot of times with different enemies, even bosses), the same happen the other way around: an enemy will get out of confusion if the bleed state is applied (didn't test as throghoutly)
-Azar interaction at the angel statue inside the minotaur cave is still bugged: if you tell her about your 'dream' and choose the first option, the dialogue rewinds itself for example. You can replay the dialogue over and over again too.
-Azar deals WAY too much damage to N'Gombe, i beat him in one turn. It's literally TOO much damage. Illfang was a little more balanced, but still an easy fight. Frankly, the hardest enemies on the game are the slimes and the slime boss in sewers.
I yet explored everything to make sure i didn't miss anything, but these are the ones i have found for now.
Hope it helps. If you prefer, i can make a 'bug page' for 3.1 ver and post this there.