Multi-measure rest compression and rehearsal marks

[Adam Griggs]

    Hello again,
    
    This has me stumped. I've been digging for hours.
    
> \version
>         "2.21.7"
>       
>       global = {
>           \skip 1*24
>           \mark \default
>           \skip 1*12
>           \mark \default
>           \skip 1*12
>       }
>       
>       music = \relative c''
>         {
>           \compressMMRests
>           R1*48
>       }
>       
>       \new Staff <<
>         \global \music >>
>     
    
    Why does multi-measure rest compression fail after the first
    rehearsal mark?
    
    
    I also tried:
> music =
>         \relative c'' {
>             \compressMMRests
>             R1*24
>             R1*12
>             R1*12
>         }
>     
    No go.