ag.algebraic geometry – Can a Chow motif be isomorphic to its own direct summand?

Let $M$ be a $R$-linear Chow motif over a field $k$ that is perfect but not necessarily algebraically closed. Can one prove that $M$ is not a direct summand of itself (that is, $Mnotcong Mbigoplus N$ for every non-zero Chow motif $N$ over $k$)?

Is this statement clear for any particular $(k,R)$ (let us assume that the exponential characteristic of $k$ is invertible in $R$)? Do there exist any counterexamples (for torsion coefficients, probably)?