Dear Rolf:
I have also tested your program under FeynCalc 4.2.0 but have gotten the non-zero answer as follows:
In[15]:= Expand[res1-res2]
Out[15]= - 8 eps l.p.p/l.o - 8 eps o.pl.p/l.o
Masaru Watanabe
This archive was generated by hypermail 2b29 : 09/04/20-12:55:05 AM Z CEST