Mapping erases search count message

I just tried exposing the search count message by removing 'S' from
'shortmess', but I couldn't see it. I discovered that it is hidden,
erased and/or not updated by a couple of my mappings.

nnoremap <silent> n nzv:call AdjCursor()<CR>
nnoremap <silent> N Nzv:call AdjCursor()<CR>

Here is a simple experiment that demonstrates the problem. Create
a file, test.vim, that contains the following.

set shortmess-=S
nnoremap <silent> n n
help map.txt

Open a standard-sized, 80x24 terminal, and in it run

$ vim -N -u NONE -i NONE -S test.vim

Then search for "command":

/command

After hitting Enter, the cursor will be at the start of "commands"
on line 7 and the command line will contain this:

/command [1/>99]

After hitting 'n', the cursor advances to line 13 and the command
line stays the same, even showing "[1/>99]" when it should be
showing "[2/>99]".

Another 'n' advances the cursor to line 17, the screen scrolls
up so that that line is at the bottom of the window, and the command
line is empty--no search count message at all.

I would think that <silent> would prevent the mapping from
disturbing the command line, in which case this is a bug.

If it's not a bug, then is there some way of defining a mapping that
does not interfere with the search count message, or some way of
restoring that message at the end of a mapping?

Regards,
Gary

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