The Digimon following behind me stopped doing anything when I turn back and talk to it. Doesn't pick up items anymore either. Not in 5+ hours of gameplay. (Still grinding up and trying to get every 'mon in the beta).
EDIT: Renamon and Zassomon lack abilities, Veggiemon doesn't learn something at level 25 like other Champions, and Moxie and Harvest don't work. And while it's not a glitch, the Ogremon fight is quite hard, and the difficulty gets a lot worse when it's holding Sirloin. IIRC, he only sometimes hold Sirloin. It pushes the difficulty a bit too far when Sirloin goes off, and it makes a big enough difference that if you do keep it, you should be sure it's there 100% of the time. (If it already is and my memory's just bad, I apologize).
EDIT 2: More curiosity than anything else, but can anything other than DemiDevimon use Wizard's Hat to become Wizardmon? I have found anything else, and my source lists Aruraumon, Goblimon, Gotsumon, Gabumon, Keramon, Palmon, Patamon, Syakomon, and Tentomon as also being able to Digivolve to Wizardmon. I haven't checked all of them, but Aruraumon, Goblimon, and Tentomon I've seen don't use it. Out of curiosity, is there one particular source you usually go to when determining digivolution lines?
Source:
https://dma.wtw-x.net/dexwizard.shtml
EDIT 3: The overworld sprite for RizeGreymon is slightly glitchy. The ends of the wings get cut off when you go through a gate to a new location. Also, the asymmetry isn't taken into account, so when you head right, the revolver switches to the wrong side. Similarly, it's on the wrong side when in battle. I kind of expected this - a lot easier to insert a mirror image than create a whole second sprite, and it doesn't really break immersion that much. It might not be worth trying to fix the mirror image issue. But the cut off ends when you enter a new area? That stands out a bit more. And as I noted in an earlier post, the transition to new areas already is unpredictably buggy.