Duration shortcut not working for rests

[William Ashton]

Hello all,

Am I misunderstanding something, or is this a bug? Since the "r4" at the
start of the second measure is fully qualified, I was expecting the "4"s
that follow it to be quarter rests as well, but I'm seeing "c"s in the
rendered output.

\version "2.25.6"

{
    c'4 r r r
    % The middle 4s are "c"s instead of rests
  | r4 4 4 b
}