Mixed Sustain Pedal Style s no different than the default Sustain Pedal Style in 2.22.2?

[Kenneth Wolcott]

HI;

  I have a Piano piece that I am engraving now that needs the mixed
Sustain Pedal Style.

  I will create an MWE shortly, however, it seems that the mixed
Sustain Pedal Style is no different than the default in Lilypond
2.22.2 (Mac homebrew).

  The default Sustain Pedal Style and the bracket style look as it is
shown in the Notation Reference, but not the mixed style.

  Known bug?

Thanks,
Ken Wolcott