The third bug is the one worth dwelling on. Dropping thinking blocks every turn instead of just once is the kind of regression that only shows up in production traffic. A unit test for "idle-threshold clearing" would assert "was thinking cleared after an hour of idle" (yes) without asserting "is thinking preserved on subsequent turns" (no). The invariant is negative space.

The real lesson is that an internal message-queuing experiment masked the symptoms in their own dogfooding. Dogfooding only works when the eaten food is the shipped food.