Pixton's conjecture: do Pixton's relations give all tautological relations on the moduli of stable curves?

Claims that Pixton's original relations are not complete in rational Chow or rational cohomology: on $\overline{\mathcal M}_{g,n}$ with $g=10^{60}$ and $n=3\binom{10^{60}}3$ an alternating product of corrected small diagonals vanishes but lies outside the span. It does NOT give a small counterexample (the parameters are not claimed minimal), does NOT address enlarged relation systems, and is distinct from the Gorenstein question already settled negatively (Petersen-Tommasi, Canning).

Claims that Pixton's original relations are not complete in rational Chow or rational cohomology: on $\overline{\mathcal M}_{g,n}$ with $g=10^{60}$ and $n=3\binom{10^{60}}3$ an alternating product of corrected small diagonals vanishes but lies outside the span. It does NOT give a small counterexample (the parameters are not claimed minimal), does NOT address enlarged relation systems, and is distinct from the Gorenstein question already settled negatively (Petersen-Tommasi, Canning).