`%%MIDI gchordoff` is not working

[tannineo]

Here is the sample abc block, please notice %%MIDI gchordoff

X: 1
T: Cooley's
M: 4/4
L: 1/8
K: Emin
%%MIDI gchordoff
|:D2|"Em"EBBA B2 EB|\
    ~B2 AB dBAG|\
    "D"FDAD BDAD|\
    FDAD dAFD|
"Em"EBBA B2 EB|\
    B2 AB defg|\
    "D"afe^c dBAF|\
    "Em"DEFD E2:|
|:gf|"Em"eB B2 efge|\
    eB B2 gedB|\
    "D"A2 FA DAFA|\
    A2 FA defg|
"Em"eB B2 eBgB|\
    eB B2 defg|\
    "D"afe^c dBAF|\
    "Em"DEFD E2:|2|A4G2:|]

In this case I just want to disable the generated chords accompaniment, or use a different chord arrangement. Please see abc2midi .

I tested both the published community plugin and the main branch build, they all have the same behavior of not processing %%MIDI gchord.