Bug: {{symptom}}.

Before proposing a fix:
1. Reproduce it with a minimal failing case.
2. Form 2-3 hypotheses for the ROOT cause (not the symptom).
3. Add logging/asserts to confirm which hypothesis is true — show evidence.
4. Only then fix the confirmed cause.
5. Add a regression test that fails before the fix and passes after.

Never patch the symptom without evidence of the cause.