When a creeper is targeting a player around a corner, instead of walking around the corner, the creeper will stop if the player stays within up to ~2 blocks square radius away from the corner.

The creeper will correctly pathfind around the corner to the player if the player immediately positions themselves further than this radius away.

To reproduce the result:

1. Have a creeper positioned along a wall where it can pathfind directly along an axis (x,z) to a corner.
2. Get the creeper to notice and pathfind to you.
3. Immediately hide just behind the corner, diagonal to where the creeper should attempt to turn the corner, and remain stationary.  You can be up to about 2 blocks away from the corner in any direction that won't catch the creeper's attention.
4. The creeper should stop just behind the corner before turning it, and will no longer track you.

The creeper loses interest once it stops, and will only randomly walk around thereafter.  You can technically move outside the ~2 block radius once it has lost interest, and never draw its attention again.  The radius only applies immediately during the pathfinding.  i.e. if you run from the creeper and immediately go 3 blocks away, it will correctly pathfind around the corner.