The Double eating bug

As many have noticed this bug has been in minecraft for ages and never gets fixed. There are many posts of this bug and it's very old. Still it won't get fixed.

So what happens is that sometimes when you eat you eat more than intended. Say you have 5 hunger bars and eat a steak. Somehow you just eat another.

So I'm just wondering why it won't gets fixed because it has been reported several times over the internet.