The reverse light are not defined in the xml.
After change
<ReverseSignals>
<Light _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.405; 0.96; 0.921)" />
<Light _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.405; 0.96; -0.921)" />
<Flare _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.405; 0.96; 0.921)" />
<Flare _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.405; 0.96; -0.921)" />
<Flare _template="BlueStreak" Color="g(220; 220; 255) x 0.05" Dir="(-1; 0; 0)" ParentFrames="BoneCargo_1_cdt" Size="0.4" Pos="(-3.405; 0.96; 0.921)" />
<Flare _template="BlueStreak" Color="g(220; 220; 255) x 0.05" Dir="(-1; 0; 0)" ParentFrames="BoneCargo_1_cdt" Size="0.4" Pos="(-3.405; 0.96; -0.921)" />
<Light _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.409; 0.95; 0.775)" />
<Light _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.409; 0.95; -0.775)" />
<Flare _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.409; 0.95; 0.775)" />
<Flare _template="ReverseSignal" ParentFrames="BoneCargo_1_cdt" Pos="(-3.409; 0.95; -0.775)" />
<Flare _template="BlueStreak" Color="g(220; 220; 255) x 0.05" Dir="(-1; 0; 0)" ParentFrames="BoneCargo_1_cdt" Size="0.4" Pos="(-3.409; 0.95; 0.775)" />
<Flare _template="BlueStreak" Color="g(220; 220; 255) x 0.05" Dir="(-1; 0; 0)" ParentFrames="BoneCargo_1_cdt" Size="0.4" Pos="(-3.409; 0.95; -0.775)" />
</ReverseSignals>
Before
After