I tried, and also could not get 0,
but this is due to the Schouten identity...
You can play with the Option Schouten of Contract (and also with
But it is non-trivial.
It really is better to just calculate scalar quantities.
I do not think that there are any bugs in DiracReduce. It is fairly simple code and biggest problem might be renaming of dummy indices,
but I think that works fine.
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