To put it correctly this seems to be a but in ToTFI which occurs when converting the expression
FAD[{p2, I mG}, {p1, I mG}, {p1, I mG}, {p1, I mG}, {p1, I mG}, {p1,
I mG}] FVD[p2, Lor1] FVD[p2, Lor2] SPD[p1, p1] SPD[p1, q]^2 //FCMultiLoopTID[#,{p1,p2}]&//ToTFI[#,p1,p2]&
=
-(1/(2 (-1 + D)))(FVD[q, Lor1] FVD[q, Lor2] -
MTD[Lor1, Lor2] SPD[q, q]) Tarcer`TFI[2 + D,
FeynCalc`SPD[
q, q], {{4, Complex[0, 1] mG}, {2, FeynCalc`ToTFI`Private`mM}, {0,
0}, {0, 0}, {0, 0}}] + (1/(2 (-1 + D)))
mG^2 (FVD[q, Lor1] FVD[q, Lor2] -
MTD[Lor1, Lor2] SPD[q, q]) Tarcer`TFI[2 + D,
FeynCalc`SPD[
q, q], {{5, Complex[0, 1] mG}, {2, FeynCalc`ToTFI`Private`mM}, {0,
0}, {0, 0}, {0, 0}}] - (1/((-1 + D) SPD[q, q]))
mG^2 (-FVD[q, Lor1] FVD[q, Lor2] +
MTD[Lor1, Lor2] SPD[q, q]) Tarcer`TFI[D,
FeynCalc`SPD[q, q], {0, 0, 2, 0,
0}, {{4, Complex[0, 1] mG}, {1, Complex[0, 1] mG}, {0, 0}, {0,
0}, {0, 0}}] + (1/((-1 + D) SPD[q, q]))
mG^4 (-FVD[q, Lor1] FVD[q, Lor2] +
MTD[Lor1, Lor2] SPD[q, q]) Tarcer`TFI[D,
FeynCalc`SPD[q, q], {0, 0, 2, 0,
0}, {{5, Complex[0, 1] mG}, {1, Complex[0, 1] mG}, {0, 0}, {0,
0}, {0, 0}}] + ((D FVD[q, Lor1] FVD[q, Lor2] -
MTD[Lor1, Lor2] SPD[q, q]) Tarcer`TFI[D,
FeynCalc`SPD[q, q], {0, 0, 2, 2,
0}, {{4, Complex[0, 1] mG}, {1, Complex[0, 1] mG}, {0, 0}, {0,
0}, {0, 0}}])/((-1 + D) SPD[q, q]^2) - (1/((-1 + D) SPD[q, q]^2))
mG^2 (D FVD[q, Lor1] FVD[q, Lor2] -
MTD[Lor1, Lor2] SPD[q, q]) Tarcer`TFI[D,
FeynCalc`SPD[q, q], {0, 0, 2, 2,
0}, {{5, Complex[0, 1] mG}, {1, Complex[0, 1] mG}, {0, 0}, {0,
0}, {0, 0}}]
The RankLimit {2,10} however seems to work so far.
Cheers,
Philipp
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