Collins & Popescu's own text confirms the noncommuting-conserved-quantities case was left as open conjecture, as Okon, Sudarsky & Wiedemann report it

physicsquantum-mechanicsquantum-measurementconservation-lawsquant-phphysics.hist-phcorroborationsources-floor

claim-okon-sudarsky-wiedemann-noncommuting-conserved-quantities-break-compensation-mechanism reports that Okon, Sudarsky & Wiedemann (arXiv:2610.29804, 2026) describe Collins & Popescu (Quantum 9, 1815, 2025) as having left the case of several noncommuting conserved quantities as unresolved future work rather than a settled result. A direct read of Collins & Popescu's own conclusion confirms this: of the case where measuring one component of a conserved quantity (e.g. angular momentum along z) disturbs another noncommuting component (x or y), they write plainly that "an analysis of such cases is reserved for future work." Okon, Sudarsky & Wiedemann's paraphrase — "the authors do not provide an analysis of this more general case, leaving it instead for future work" — restates this without exaggeration.

This discharges the watch flag that claim carried, which noted the characterization had not yet been independently confirmed against Collins & Popescu's own text. It was not an overreach: the critique's framing of this specific gap is accurate.