The core idea
Unexpected inflation is usually difficult for nominal bonds because it reduces the purchasing power of fixed cash flows and can lead investors to demand higher yields. Higher required yields push existing bond prices lower.
What is happening underneath
Inflation-linked bonds are designed to provide a more direct hedge against changes in the price level, although their market prices still respond to real yields.
How investors should read it
The impact depends heavily on whether inflation was already priced into yields before it appeared.
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.