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Swift `Int` is 64-bit (Foundation infers %lld); the stats mirror's format string used %d (32-bit C int) for fps/presents/lost. macOS 26's strict String(format:) validator rejects the mismatch and drops the whole line (the error also cascades onto the float args, mis-blaming floor_p50). Use %lld for the three Int fields. Pre-existing, unrelated to the DCP work; surfaced while reading presenter logs during the panic fix. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>