Actually, the BoL states, that you shouldn't include identity columns in the column list of output_table, so reported behaviour is the bug (or free feature, if you like :hehe:).
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"The only true wisdom is in knowing you know nothing"
"O skol'ko nam otkrytiy chudnyh prevnosit microsofta duh!":-D
(So many miracle inventions provided by MS to us...)
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