Hostile mobs AI messes up sometimes

Sometimes, hostile mobs AI's mess up. For example, any kind of hostile mob would look at something else instead of you. And a mob would walk straight torwards a cactus and not find a way around it. And in the photo, there's a zombie walking away instead of walking to me.

What I expected to happen was...:
Hostile mobs to have smart AIs

What actually happened was...:
The AIs aren't as smart as the PC version

Steps to Reproduce:(this won't reenact the same issue I had, but here's an example)
1. Place a cactus inbetween you and a hostile mob
2. Make the mob walk into the cactus
3. They will not find a way around it, they will just keep walking forward until they are not walking into the cactus anymore.