Can you provide the output of
amps //FCE// InputForm
if it is not too large? If it is too large, perhaps just the amplitude of one relevant diagram
where it happens
e.g.
amps = FCFAConvert[CreateFeynAmp[diags, Truncated -> True,GaugeRules->{},PreFactor->1/((2^D)*(Pi)^(D/2))],
> IncomingMomenta->{p},OutgoingMomenta->{p},LoopMomenta->{q},UndoChiralSplittings->True,ChangeDimension->D,List->True,SMP->True];
amps[[2]] //FCE// InputForm
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