Puppy suddenly refusing to eat kibble.

I’ve had my puppy on Purina Pro Plan Salmon kibble since I brought him home at 10 weeks. He’s 7 months now and just 2-ish weeks ago he’s refusing to eat it.

I tried it with water, adding some peanut butter or yogurt, some toppers, different bowls… he just eats around it and leaves the kibble.

I thought maybe the bag went bad so I bought another new bag and same thing. So then I thought maybe I’d try a new flavour and same thing!

I know it’s not his appetite because he still happily eats treats, toppers, etc.

I’m not sure why he’s suddenly refusing to eat it. I’m thinking of picking up Hills Science later today in hopes he will like it better but I’m just confused why this sudden change in behaviour. I’m also frustrated that I have wasted puppy kibble now.