The core idea
No. Treasuries are widely treated as high-quality liquid assets, but their market prices remain exposed to interest-rate, inflation and liquidity risk.
What is happening underneath
They can fall sharply when yields rise, even without any deterioration in U.S. payment capacity.
How investors should read it
Safe-haven status refers to market function and credit characteristics, not guaranteed positive returns.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.