syntax for "map key test?'cmd1':'cmd2'|:cmd3|:cmd4"

I have the following (pseudo code) mapping working:
nmap <expr> key some-expr ?
  \ 'cmd1<Bar>:cmd3<CR><Bar>:cmd4<CR>' :
  \ 'cmd2<Bar>:cmd3<CR><Bar>:cmd4<CR>'

As you can see the conditional selects between cmd1 and cmd2,  but both execute cmd3 and cmd4.

I'd like to move cmd3 and cmd4 outside of the conditional as in
nmap <expr> key some-expr?'cmd1':'cmd2'<Bar>:cmd3<CR><Bar>:cmd4<CR>
The problem is I get cmd1 or cmd2 to execute, but never cmd3 or cmd4.
I know I could move this to a function but I'd like to understand the syntax.

Thank you

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