Simultaneous \key markings behave differently to \clef or \time.

[Richard Shann]

I've noticed that two \key in succession results in the first being
honored while the opposite is true for everything else I've tested.
Consider:
8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><
\version "2.22.0"

{
  \time 3/4 \time 5/4 c''
}
{
  \clef bass  \clef alto c''
}
{
  c'' \bar "||" \bar ":..:"
}
{
  \key f \major \key d \major c''
}
8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><

Not a problem except when using include files or (as in my case
generating the code programmatically.

Is there a good reason for this, or is it just a wrinkle that could be
fixed?

Richard Shann