I am looking at the reactions of positive Kaons and am looking at $$K^+\to\pi^++\pi^0$$
Since the strangeness is not conserved, this has to be a Weak decay. When I try to make the Feynman diagrams for this decay, I cannot make one that is not a flavor changing neutral current. However, PDG says the fraction of this decay is $21\%$. This does not make sense as this is a very high fraction for a suppressed decay mode. What am I missing?