The core idea
Banks hold government bonds for liquidity management, collateral, regulatory requirements, interest income and balance-sheet positioning.
What is happening underneath
The securities can also be used in repo and central-bank operations.
How investors should read it
Large unrealized losses can still matter when yields rise, particularly if funding pressure forces assets to be sold.
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.