No effect of the auto fill bonus

Hello, I've noticed that a bonus has been added to those players who choose "Fill" as 'lane'. When you fill, you get a bonus, which ensures that you get one of those lanes that you picked. This is great! But I tried picking Jungle primary, and fill secondary with that auto fill bonus. I got support...... How come? I picked fill secondary, but I was promised one of my roles that I picked, which I always am. Pick top + bot and you're ensured top or bot, not support, jungle or mid. So what good does the bonus do? As I see it: Nothing
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