yes, there is right now a problem with the
trace function (I am working on it right now).
You can easily work around it like this:
tr = TR[Calc[#]]&;
tr[Calc[(P2 + m).(al - be).(P1 + m)]] // Factor2 // FCE // InputForm
8*(SP[a, p2]*SP[p1, pp] - SP[a, p1]*SP[p2, pp])
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