bar numbers right aligned (default) on wrong bar?

[Paul Scott]

In 2.7.34 the bar numbers appear to be right aligned on the previous bar.

Paul Scott

\version "2.7.34"

\relative c '' { 
  \time 4/4 
  \override Score.BarNumber #'break-visibility = #end-of-line-invisible
  \set Score.barNumberVisibility = #(every-nth-bar-number-visible 1)
  \override BarNumber #'self-alignment-x = #-1
  a1 b c d 
}