Found while re-verifying the full PC2 test suite from a fresh clone:
the "prediction buffer has entries" check failed ~1 in 3 runs. Root
cause is a genuine race in the test, not in prediction/reconciliation
itself -- a server snapshot RPC can land on the 60-frame loop's final
`await process_frame`, triggering a legitimate reconciliation that
clears the buffer (network_client.gd's documented behavior) right
before the check reads it. The desync-correction check right after it
already proves reconciliation logic works correctly on its own, so
this was never actually catching a real bug -- just occasionally
racing a real correction event.
Fix: one more predict_and_send() right before the check guarantees a
fresh buffer entry regardless of whether a correction just fired.
Verified 5/5 clean runs against a real dedicated server after the fix
(previously observed a failure within 3 runs).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01M6rUEynmv2QmweocAQYARN
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