MusicChange hook fires twice per level load

[mazmazz]

Sonic Robo Blast 2 v2.1.20 (Mar  4 2018 01:52:44 38fc17dc)
Speeding off to level...
Changing Map from 1
MusicChange from  to MAP01M | MapIsChanging true
MusicChange from MAP01M to MAP01M | MapIsChanging true
Loaded Map to 1
$map map02
Speeding off to level...
Changing Map from 1
MusicChange from MAP01M to MAP02M | MapIsChanging true
MusicChange from MAP02M to MAP02M | MapIsChanging true
Loaded Map to 2
$map map03
Speeding off to level...
Changing Map from 2
MusicChange from MAP02M to MAP03M | MapIsChanging true
MusicChange from MAP03M to MAP03M | MapIsChanging true
Loaded Map to 3
Changing Map from 3
MusicChange from MAP03M to MAP03M | MapIsChanging true
MusicChange from MAP03M to MAP03M | MapIsChanging true
Loaded Map to 3

local MapIsChanging = false

local function OnMapChange(oldmapnum)
    MapIsChanging = true
    print(string.format('Changing Map from %s', tostring(oldmapnum)))
end

local function OnMapLoad(mapnum)
    MapIsChanging = false
    print(string.format('Loaded Map to %s', tostring(mapnum)))
end

local function OnMusicChange(oldname, newname, flags, looping)
    print(string.format('MusicChange from %s to %s | MapIsChanging %s', oldname, newname, tostring(MapIsChanging)))
end

addHook('MapChange', OnMapChange)
addHook('MapLoad', OnMapLoad)
addHook('MusicChange', OnMusicChange)

[mazmazz]

Does the game call S_MusicChange twice per map load internally?