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FlowDDPMStageTrainer._compute unconditionally called router.balance_loss/classify_loss/entropy_loss whenever a router existed, then only added each term into total if its lambda was > 0 -- so every routed run paid for balance_loss/entropy_loss's extra router.gate(...) forward passes even at the default lambda_balance = lambda_proc = lambda_entropy = 0.0 (the exact config the failed 2026-07-22 router benchmark ran). Guard each computation on the same > 0 condition that already guarded the addition, matching WGANStageTrainer's cost structure which has no router-loss block at all. total's value is unchanged either way. Added a test that spies on the router's three loss methods and checks call counts both at lambda=0 (must be skipped) and lambda>0 (must still run, so the guard doesn't suppress the real path). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>