Since @siimphh commented, I don’t have to look further than the last two games to find an example
Winning, winning, winning vs a 25kyu, randomly ignore an Atari on a group of 17 stones = game over
No player, bot or otherwise can have a consistent level if you do that randomly.
I think the bots need a safeguard in their move logic.
If you’re going to randomly choose to make a mistake, don’t ever choose a mistake bigger than size X, which might depend on their rank.