Trimmed surface offset no working

hello everyone ,

here i tried to offset a trimmed surface and its not working could not understand how to solve it


trimmed surface (13.1 KB)

Normally,Offset Surfaceshould be expected to work on ‘Trimmed Surface’, but not in this case… I have no idea why. Here is a workaround.

trimmed surface (15.9 KB)

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thanks @HS_Kim
its much help full to me