Circular sheet metal part does not show certain features

A circular sheet metal part contains some holes (cut extrude 8), however when I wrap the part using the flatten command the holes are greyed out and no longer show within the part. They re-appear when I flatten the part.
I'm missing something but it is not obvious, any tips would be much appreciated.
Basic example attached.

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1 Answer

Oh yes, instead of flattening and cutting from that, unfold the bend, cut, then fold again. (the fold and unfold sheet metal feature commands)

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