and set list problem

when i set list and then type four tab in a newline like

\t\t\t\t
when i "set list" , i type backspce for juse one time
this four tabs were delete ,

but when i "set nolist" ,i works well
why…

my settings

set tabstop=8
set noexpandtab
set backspace=indent,eol,start

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