% MWE for post-event ordering via event-function and wrapper

\markup #(lilypond-version)

ts-first-second = 
#(define-event-function () () 
#{ -"1st" -"2nd" #} ) % 

{
  \displayScheme 
  {
    s1 r1 -"1st" -"2nd"
    s1 r1 \ts-first-second  % v2.20 1st 2nd ; v2.22 2nd 1st
  } % cf  2.19.21 script-stack-order.ly
}

% related tests:
% 2.21.0  post-events-from-scheme.ly
% 2.21.1  post-events-wrapper-direction.ly