There's a big difference between accounting for KNOWN risks wrt managing your treasury - something that every bank does as a matter of course - and trying new things.
What kind of bank doesn't know about interest rate risk? That's their whole business.
That's what I'm saying. That's not the bank doing anything fancy and failing because of it, it's them not doing the basic things every bank should be doing.
Surely having your reserves locked up in assets that you can't sell without taking large losses is a known risk?