Manually break figured bass extenders for only some numbers

Figured bass often uses extenders to indicate continuation of the corresponding step. LilyPond tries to make extenders as long as possible, which is not always wanted. To break individual extenders, append the modifier \! to a number.

\version "2.24"

bassfigures = \figuremode {
  \set useBassFigureExtenders = ##t
  <6 4>4 <6 4\!> <6 4\!> <6 4\!> |
  <6\! 4\!>  <6 4> <6 4\!> <6 4>
}

<<
  \new Staff \relative c'' { c1 c1 }
  \new FiguredBass \bassfigures
>>