[Gameplay] Soraka Bot stops responding in Twisted Treeline

Steps to reproduce:

1. Set up a custom Twisted Treeline game. Assign bot Soraka/difficulty Beginner to the enemy team.
2. Start the game and pick Fiddlesticks. (Resulting in a 1v1 matchup.)
3. Drain Soraka in game.

Expected behavior: Soraka Bot runs out of the range of Drain, stopping it. Observed behavior: Soraka Bot runs to the exact edge of Drain and stands there. If Drain does not kill her, she will continue to stand in that spot for a few seconds, allowing you to attack her further/Drain her again/etc. until you kill her.

So many variables, I couldn't tell where the error lies. But this is what happened to me.

(And yes, it's an oblique error that would probably be way down on the list. She runs out of the range of Drain properly in Summoner's Rift, for example. But it's a bug, so here you go.)