Since 4.26.0 update, and a lot of people got banned. Today, with the 4.27.0 update, just a few mins after I updated the game, I got banned.
According to someone, there's a 1KB file that you download that checks whatever you do in battle INCLUDING PvE.
I'm not gonna go too much in details, but in short, mods are no longer safe in this game. They were safe before, like really safe actually, but pretty much since they released the Legends Ranking in March 2023, and you have a very chance to get banned by using mods.