The bug

When you lead an animal, it will have a small area to walk in that doesn't go beyond the lead limits.
If you tamed a cat and went sleeping it will come and sleep on your bed and in the morning it will be outside, hunting chickens.
You leashed your cat into a fence in your house the cat still finds a way to 'teleport' outside, the amount of blocks it can walk through while leashed is tiny so it can't simply go outside, resulting it to be stuck outside the house (if the lead is near enough)

What I expected

Once I leash the cat on a fence it shouldn't go outside anymore and basically not trying to follow me

Steps to reproduce

Put a fence next to your bed and leash the your cat into it, then go to sleep. The cat will be sent outside your house
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In the images:

> A cat managed to teleport outside while leashed to the house making it be stuck

> The fence in the house is basically tied into the cat outside the house, the cat no longer can go inside.

> I tied a cat into the top of the house (in order to test if the cat will drop the lead and go far away, impossible for a cat to do it itself.) And yes, the cat managed to somehow cut the lead and and go outside the house

Also, dogs and cats will teleport to you if you got far, even if you leashed them.