It's probably that sword again... It was bugged when it was initially released, so maybe there's something else going on there.
I'll test it, no need for the video, thank you!
I remembered, could it really be the sword? I remember that when this bug happened, I loaded old saves and it still continued, so I had the idea to unequip all the equipment from Mayabi, cuz it happened 2 hours after I added her to my team, I tried to remove all equips including the sword and the bug still going on, or I had to find a auto save that the bug didn't happen yet or remove her from the team in any save(including the most recent) and the bug was resolved.
I apologize if this wasn't very helpful, and I only wasted your time. As I said, I didn't read the changelog; this bug happened almost two months ago (version 1.10) I was very busy before, and at the time I didn't come up with the idea to record it or make a copy of the save. If any bug ever happen again I'm going to record it immediately and show every possible detail, but before reporting I'll check if I'm using the lastest version :3