Yi Ignores Taliyah's Wall?

Either it's a visual bug or a glitch because he appeared inside the wall. Maybe the system didn't understand where he was so he was and what part of the wall he can't cross so it decided he was both.

Because the knock back/up aspect of the wall in a one shot trigger and he reappeared after it went off, the wall let him stay inside it until he left the object and became stuck between it and the wall of the blue buff enclosure. It's just some spaghetti code.