Looks like an unpleasant bug. The only workaround I see is the commented override in the example below.
{ b1
% \once\override Score.BarLine #'space-alist #'clef = #'(minimum-space . 2.5)
\once \override Score.BreakAlignment #'break-align-orders = #(make-vector 3
'( staff-bar clef ))
\bar":|:"
\clef "alto"
b1 }
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