No, but in this case there is no monkfish, only cod. If I wanted monkfish I wouldn't want to be offered cod, just told that they don't have any. Isn't this really the same as asking for monkfish and only being offered cod?

To be fair to the OP, I do get annoyed that when changing a reward flight search, the destination and dates always stick, but the class always reverts to Economy. I'm sure that there are cases where people have accidentally bought a flight in Economy when they wanted monkfish, er I mean First.