nnoremap nmap confusion

The plugin srstevenson/vim-picker defines a list of mappings:

nnoremap <silent> <Plug>(PickerEdit) :PickerEdit<CR>

I tried to bind this mapping with

nnoremap <unique> <leader>E <Plug>(PickerEdit)

This fails with no error but the function seems to be not called. I get
a "beep" from my terminal bell. map shows me

n ,E * <Plug>(PickerEdit)

If I use nmap to bind the mapping this works:

nmap <unique> <leader>E <Plug>(PickerEdit)

and map shows:

n ,E <Plug>(PickerEdit)

The star (*) is missing in the nmap defined mapping. What does this star
mean? I always use nnoremap because of cargo-cult. This seems to be
wrong?

Kai

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