Determine the position we left off before moving to the command line

I'm searching a way to determine the last cursor position before entering the command line to execute a command defined with

:command -range=% aaa call <line1>,<line2>func().

If I start from a visual block, I'm able to retrieve that position with line(".") or a:firstline in func().

However, if I don't use a range, e.g. if I just enter :aaa, I'm unable able to determine that position as line(".")/a:firstline are both 1.

I tried to resort to defining the command like so

:command -range=% aaa normal ma| <line1>,<line2>call ... | normal `a

but to no avail; func() wouldn't get executed...

Any tips?

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