There is a race where the chain tip may have started polling but contenders have not yet. It is more robust to answer polls until we see local_winner_cid (and the chain tip will have started polling before that, but we ultimately don't care about this).

Run a few times:

for I in {0..10}; do ./test/functional/test_runner.py abc_p2p_avalanche_contender_voting || break ; done