Midi: tremolo vs n:m

[Benjamin Tordoff]

Hi all,

My understanding is that "\repeat tremolo 4 {c16}" and "c4:16"  should be 
equivalent, the latter just being a (welcome) shortcut for the former. In the 
PDF output (without expanding repeats) they look identical however in the midi 
playback (with repeats expanded) the former plays as four semi-quavers but the 
latter as a single crotchet. This seems wrong.

% This should produce 8 semi-quavers:
\version "2.23.10"
\score {
        \unfoldRepeats {
                \repeat tremolo 4 {c'16} 
                c'4:16
        }
        \midi {}
}

Is this a bug, or am I doing something wrong here?

Thanks

Ben