Auto jump activates automatically on sets of stairs only with jump boost 2 or higher. 

To replicate, open survival world, get the effect jump boost 2, with auto jump on in the touch control settings, and just run up a flight of stairs blocks.

https://drive.google.com/file/d/1OnYtBxgElD8Vk9HBJeaVMAQOj5o7v5di/view?usp=drivesdk

https://drive.google.com/file/d/1OjdtdJGMSJT7ZPl4LTT2_WJBky0KWvZe/view?usp=drivesdk

https://drive.google.com/file/d/1OiIvwP02O4PZgFJe1KmZFo07sFnG8vfj/view?usp=drivesdk