I don't know if this is new or not, but Find will not locate all of the instances of text in the Description field unless I have Sort by Data-Block Number/ID selected.
If I have Sort by Element or by Nickname, it will only jump to subsets based on where the selection is. E.g., If I am in X or Y area, that's all it will look in. If I am not in that area, it won't find X or Y instances.
Is this intended for some reason?
BTW, I just checked and v2.3 is the same.