I guess it was probably my mistake of rushing to upload an updated version to Itch.io that I didn't stop to test it out, given that I had only recently solved a problem I've had for some time :p
I'll try playing the game from where I last stopped (I noticed the fight with Avatar XO1 has been made easier;)), and if it still has the same problem, I'll start all over and get to that point again to verify that the demo is indeed bugged at AC-K2's section :)