Does it follow that any element of $J(A)$ is necessarily nilpotent?

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Let $A[x]$ be the algebra of polynomials with coefficients in a $k$-algebra $A$. Assume that, for any simple $A[x]$-module $M$, one has $\text{End}_{A[x]}M = k$. Does it follow that any element of $J(A)$ is necessarily nilpotent?