Since 265d7c44b1aae06aee93f745a865807732218a73, when wait_until() fails, an error message is logged to the test framework log. This means that if wait_until() is called inside a try-except with the expectation that it will fail, a spurious error message is logged.
wait_until() shouldn’t be called with the expectation of failure. Fix that in p2p_segwit.py.