Who will end up holding all those fixed low rate long maturity date bonds ?

SIVB bancryptucy seems like a gurentee in such a shift from low to high interest enviroment and it made me wounder about the remaining 600bn$ in unrealized losses according to bloomberg held by other banks / financial institutes.

it seems like all those bonds will end up with 20% or more loss in market value, that's a huge loss for institutes that were for years trying to make 1-2% on deposits.