Block Command - 2004

I have a question concerning the modification of an existing
block.
I noticed in AC 2004, that if the name is 'typed' in the
Block GUI, that redefinition of a block proceeds as normal
with updates to existing blocks of the same name.
On the other hand, if you 'select' the same name from the pop
down menu of existing blocks, AC deletes the existing blocks
from the drawing.
Has this been fixed, or is this just one of those things you
avoid?